Octopi to printer connection problem

I have octoprint loaded and connected to my network and computer on Rasbery Pi 3.
I get the octoprint screen, but it won't connect to the printer. Monoprice 200V2. I press the connect button but always give the failed message in the setup window. I have looked at forums and they seem to talk a lot about serial ports. dmesg, and other stuff I am sadly ignorant on. I could really use some layman termed guidance.

Thanks

Try it again with the Malyan/Monoprice Connection Fix plugin :slight_smile:

When you created this new topic, the screen was filled with instructions like Read this first! Remember to provide version numbers, relevant log files and general information about your setup.

Since you ignored those instructions, there is very little we can do to provide assistance. If you provide the additional information, then someone will gladly try and help.

3 Likes

i am trying to update the post with new info but i get a message that says new users can only put 2 links in a post. I'm not sure what that refers too. Any help? thanks

Try it again, I've adjusted your rights.

B-morgan, thanks.
I will try again and hopefully a bit better this time.

I can't connect to our printer from Rasbery Pi3. the connect button on Octoprint leads to the failure statement: Error: Failed to autodetect serial port, please set it manually.

I have Octoprint 1.4.0 running on Octopi 0.17.0 on windows 10
the printer is Monoprice mp select V2

below are the Octoprint.log and Serial.log

if you are able to help thanks. Happy to provide additional info, please just let me know. still very knew to this whole thing.

here is the Octoprint.log

2020-03-25 15:17:00,588 - octoprint.server.heartbeat - INFO - Server heartbeat <3
2020-03-25 15:17:00,882 - octoprint.server - INFO - --- Log roll over detected ---------------------------------------------------
2020-03-25 15:17:00,885 - octoprint.server - INFO - OctoPrint 1.4.0
2020-03-25 15:17:00,906 - octoprint.plugin.core - INFO - 15 plugin(s) registered with the system:
|  Action Command Prompt Support (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/action_command_prompt
|  Announcement Plugin (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/announcements
|  Anonymous Usage Tracking (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/tracking
|  Application Keys Plugin (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/appkeys
|  Backup & Restore (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/backup
|  Core Wizard (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/corewizard
|  Discovery (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/discovery
|  Error Tracking (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/errortracking
|  Logging (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/logging
|  Login UI (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/loginui
|  Pi Support Plugin (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/pi_support
|  Plugin Manager (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/pluginmanager
|  Printer Safety Check (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/printer_safety_check
|  Software Update (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/softwareupdate
|  Virtual Printer (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/virtual_printer
Prefix legend: ! = disabled, # = blacklisted, * = incompatible
2020-03-25 15:17:01,000 - octoprint.environment - INFO - Detected environment is Python 2.7.16 under Linux (linux2). Details:
|  hardware:
|      cores: 4
|      freq: 1200.0
|      ram: 917016576
|  os:
|      id: linux
|      platform: linux2
|  plugins:
|      pi_support:
|          model: Raspberry Pi 3 Model B Rev 1.2
|          octopi_version: 0.17.0
|  python:
|      pip: 19.3.1
|      version: 2.7.16
|      virtualenv: /home/pi/oprint
2020-03-25 15:17:01,000 - octoprint.server - INFO - ------------------------------------------------------------------------------
2020-03-25 15:17:01,565 - octoprint.plugins.tracking - INFO - Sent tracking event ping, payload: {'octoprint_uptime': 20}
2020-03-25 15:17:02,491 - octoprint.plugins.tracking - INFO - Sent tracking event pong, payload: {'plugins': u''}
2020-03-25 15:17:03,247 - octoprint.plugins.tracking - INFO - Sent tracking event system_unthrottled, payload: {'throttled_mask': 327680, 'throttled_voltage_now': False, 'throttled_voltage_past': True, 'throttled_overheat_now': False, 'throttled_now': False, 'throttled_past': True, 'throttled_overheat_past': False}
2020-03-25 15:17:05,743 - octoprint.server.preemptive_cache - INFO - ... done in 10.78s
2020-03-25 15:17:48,707 - octoprint.server.util.flask - INFO - Passively logging in user Foust from ::ffff:10.0.0.188
2020-03-25 15:17:48,711 - octoprint.access.users - INFO - Logged in user: Foust
2020-03-25 15:17:50,480 - octoprint.server.util.sockjs - INFO - New connection from client: ::ffff:10.0.0.188
2020-03-25 15:17:50,665 - octoprint.server.util.flask - INFO - Passively logging in user Foust from ::ffff:10.0.0.188
2020-03-25 15:17:50,667 - octoprint.access.users - INFO - Logged in user: Foust
2020-03-25 15:17:53,049 - octoprint.plugins.announcements - INFO - Loaded channel _important from https://octoprint.org/feeds/important.xml in 0.82s
2020-03-25 15:17:54,147 - octoprint.plugins.announcements - INFO - Loaded channel _releases from https://octoprint.org/feeds/releases.xml in 0.81s
2020-03-25 15:17:55,876 - octoprint.plugins.announcements - INFO - Loaded channel _blog from https://octoprint.org/feeds/octoblog.xml in 0.75s
2020-03-25 15:17:56,641 - octoprint.plugins.announcements - INFO - Loaded channel _plugins from https://plugins.octoprint.org/feed.xml in 0.68s
2020-03-25 15:17:57,598 - octoprint.plugins.announcements - INFO - Loaded channel _octopi from https://octoprint.org/feeds/octopi.xml in 0.82s
2020-03-25 15:17:58,900 - octoprint.plugins.pluginmanager - INFO - Loaded plugin repository data from https://plugins.octoprint.org/plugins.json
2020-03-25 15:18:00,912 - octoprint.plugins.pluginmanager - INFO - Loaded plugin notices data from https://plugins.octoprint.org/notices.json
2020-03-25 15:18:02,816 - octoprint.util.pip - INFO - Using "/home/pi/oprint/bin/python2 -m pip" as command to invoke pip
2020-03-25 15:18:06,666 - octoprint.util.pip - INFO - pip installs to /home/pi/oprint/lib/python2.7/site-packages/ (writable -> yes), --user flag needed -> no, virtual env -> yes
2020-03-25 15:18:06,668 - octoprint.util.pip - INFO - ==> pip ok -> yes
2020-03-25 15:18:06,685 - octoprint.plugins.softwareupdate - INFO - Saved version cache to disk
2020-03-25 15:18:06,826 - octoprint.server.util.sockjs - INFO - User Foust logged in on the socket from client ::ffff:10.0.0.188
2020-03-25 15:22:42,887 - octoprint.plugins.softwareupdate - INFO - Saved version cache to disk
2020-03-25 15:23:26,064 - octoprint.util.comm - INFO - Changing monitoring state from "Offline" to "Detecting serial port"
2020-03-25 15:23:26,103 - octoprint.util.comm - INFO - Changing monitoring state from "Detecting serial port" to "Error: Failed to autodetect serial port, please set it manually."
2020-03-25 15:23:26,866 - octoprint.plugins.tracking - INFO - Sent tracking event commerror_autodetect_port, payload: {u'throttled_now': False, u'throttled_past': True, 'commerror_text': u'Failed to autodetect serial port, please set it manually.', u'throttled_mask': 327680}

here is the serial.log

2020-03-22 17:55:41,465 - Changing monitoring state from "Offline" to "Detecting serial port"
2020-03-22 17:55:41,871 - Serial port list: []
2020-03-22 17:55:41,872 - Changing monitoring state from "Detecting serial port" to "Error: Failed to autodetect serial port, please set it manually."
2020-03-22 17:55:42,180 - Failed to autodetect serial port, please set it manually.
2020-03-25 15:23:26,063 - Changing monitoring state from "Offline" to "Detecting serial port"
2020-03-25 15:23:26,101 - Serial port list: []
2020-03-25 15:23:26,102 - Changing monitoring state from "Detecting serial port" to "Error: Failed to autodetect serial port, please set it manually."
2020-03-25 15:23:26,106 - Failed to autodetect serial port, please set it manually.

From the serial.log, the Serial port list is empty and I'm guessing that's not a good thing. Further debugging is going to involve using Linux commands on the RPi. I'll assume you have a Windows desktop machine so the first step is to install PuTTY. Using PuTTY, you will connect to the RPi using the username "Pi" and the password you changed.

Follow the steps in this thread which should help identify how the printer presents itself to the RPi.

Keep track of each step you take in this process and be prepared to provide those steps and as much information as you can capture here so we can help you solve this problem.

I have dmesg from the Pi and can't find anything that looks like the /dev/tty or tty that is suggested i find in the last 20 lines or so.

I tried to past the dmesg in this reply but it wouldn't let me. Any help with that?

Thanks

I'm not sure why you can't post your dmesg output here. Hopefully, someone with more Discourse experience can help.

Typically, you unplug the printer, do a dmesg, plug in the printer, and do another dmesg. You can then compare the two and see the device that appears when you plug in the printer.

below are, hopefully, to dmesg records (?). the first is the with the monoprice 3v2 unconnected from the Pi, the second is with it connected.

OctoPrint version : 1.4.0
OctoPi version : 0.17.0

pi@octopi:~ $ dmesg
[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 4.19.75-v7+ (dom@buildbot) (gcc version 4.9.3 (crosstool-NG crosstool-ng-1.22.0-88-g8460611)) #1270 SMP Tue Sep 24 18:45:11 BST 2019
[    0.000000] CPU: ARMv7 Processor [410fd034] revision 4 (ARMv7), cr=10c5383d
[    0.000000] CPU: div instructions available: patching division code
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[    0.000000] OF: fdt: Machine model: Raspberry Pi 3 Model B Rev 1.2
[    0.000000] Memory policy: Data cache writealloc
[    0.000000] cma: Reserved 8 MiB at 0x37800000
[    0.000000] On node 0 totalpages: 229376
[    0.000000]   Normal zone: 2016 pages used for memmap
[    0.000000]   Normal zone: 0 pages reserved
[    0.000000]   Normal zone: 229376 pages, LIFO batch:63
[    0.000000] random: get_random_bytes called from start_kernel+0xac/0x4b4 with crng_init=0
[    0.000000] percpu: Embedded 17 pages/cpu s39488 r8192 d21952 u69632
[    0.000000] pcpu-alloc: s39488 r8192 d21952 u69632 alloc=17*4096
[    0.000000] pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 227360
[    0.000000] Kernel command line: coherent_pool=1M 8250.nr_uarts=0 bcm2708_fb.fbwidth=656 bcm2708_fb.fbheight=416 bcm2708_fb.fbswap=1 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000  console=ttyS0,115200 console=tty1 root=PARTUUID=6c586e13-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait
[    0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
[    0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
[    0.000000] Memory: 886308K/917504K available (8192K kernel code, 629K rwdata, 2176K rodata, 1024K init, 821K bss, 23004K reserved, 8192K cma-reserved)
[    0.000000] Virtual kernel memory layout:
                   vector  : 0xffff0000 - 0xffff1000   (   4 kB)
                   fixmap  : 0xffc00000 - 0xfff00000   (3072 kB)
                   vmalloc : 0xb8800000 - 0xff800000   (1136 MB)
                   lowmem  : 0x80000000 - 0xb8000000   ( 896 MB)
                   modules : 0x7f000000 - 0x80000000   (  16 MB)
                     .text : 0x(ptrval) - 0x(ptrval)   (9184 kB)
                     .init : 0x(ptrval) - 0x(ptrval)   (1024 kB)
                     .data : 0x(ptrval) - 0x(ptrval)   ( 630 kB)
                      .bss : 0x(ptrval) - 0x(ptrval)   ( 822 kB)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
[    0.000000] ftrace: allocating 26399 entries in 78 pages
[    0.000000] rcu: Hierarchical RCU implementation.
[    0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
[    0.000000] arch_timer: cp15 timer(s) running at 19.20MHz (phys).
[    0.000000] clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0x46d987e47, max_idle_ns: 440795202767 ns
[    0.000007] sched_clock: 56 bits at 19MHz, resolution 52ns, wraps every 4398046511078ns
[    0.000023] Switching to timer-based delay loop, resolution 52ns
[    0.000293] Console: colour dummy device 80x30
[    0.000904] console [tty1] enabled
[    0.000962] Calibrating delay loop (skipped), value calculated using timer frequency.. 38.40 BogoMIPS (lpj=192000)
[    0.001008] pid_max: default: 32768 minimum: 301
[    0.001365] Mount-cache hash table entries: 2048 (order: 1, 8192 bytes)
[    0.001401] Mountpoint-cache hash table entries: 2048 (order: 1, 8192 bytes)
[    0.002338] CPU: Testing write buffer coherency: ok
[    0.002818] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
[    0.003485] Setting up static identity map for 0x100000 - 0x10003c
[    0.003653] rcu: Hierarchical SRCU implementation.
[    0.004462] smp: Bringing up secondary CPUs ...
[    0.005321] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
[    0.006250] CPU2: thread -1, cpu 2, socket 0, mpidr 80000002
[    0.007115] CPU3: thread -1, cpu 3, socket 0, mpidr 80000003
[    0.007237] smp: Brought up 1 node, 4 CPUs
[    0.007318] SMP: Total of 4 processors activated (153.60 BogoMIPS).
[    0.007341] CPU: All CPU(s) started in HYP mode.
[    0.007362] CPU: Virtualization extensions available.
[    0.008347] devtmpfs: initialized
[    0.021304] VFP support v0.3: implementor 41 architecture 3 part 40 variant 3 rev 4
[    0.021577] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[    0.021625] futex hash table entries: 1024 (order: 4, 65536 bytes)
[    0.022241] pinctrl core: initialized pinctrl subsystem
[    0.023123] NET: Registered protocol family 16
[    0.026034] DMA: preallocated 1024 KiB pool for atomic coherent allocations
[    0.031671] hw-breakpoint: found 5 (+1 reserved) breakpoint and 4 watchpoint registers.
[    0.031707] hw-breakpoint: maximum watchpoint size is 8 bytes.
[    0.031930] Serial: AMBA PL011 UART driver
[    0.034225] bcm2835-mbox 3f00b880.mailbox: mailbox enabled
[    0.069072] bcm2835-dma 3f007000.dma: DMA legacy API manager at (ptrval), dmachans=0x1
[    0.070998] SCSI subsystem initialized
[    0.071233] usbcore: registered new interface driver usbfs
[    0.071315] usbcore: registered new interface driver hub
[    0.071426] usbcore: registered new device driver usb
[    0.090294] raspberrypi-firmware soc:firmware: Attached to firmware from 2019-09-24 17:39, variant start_x
[    0.100128] raspberrypi-firmware soc:firmware: Firmware hash is 6820edeee4ef3891b95fc01cf02a7abd7ca52f17
[    0.111750] clocksource: Switched to clocksource arch_sys_counter
[    0.201400] VFS: Disk quotas dquot_6.6.0
[    0.201511] VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[    0.201688] FS-Cache: Loaded
[    0.201936] CacheFiles: Loaded
[    0.211925] NET: Registered protocol family 2
[    0.212716] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 6144 bytes)
[    0.212780] TCP established hash table entries: 8192 (order: 3, 32768 bytes)
[    0.212911] TCP bind hash table entries: 8192 (order: 4, 65536 bytes)
[    0.213115] TCP: Hash tables configured (established 8192 bind 8192)
[    0.213270] UDP hash table entries: 512 (order: 2, 16384 bytes)
[    0.213336] UDP-Lite hash table entries: 512 (order: 2, 16384 bytes)
[    0.213669] NET: Registered protocol family 1
[    0.214254] RPC: Registered named UNIX socket transport module.
[    0.214280] RPC: Registered udp transport module.
[    0.214302] RPC: Registered tcp transport module.
[    0.214324] RPC: Registered tcp NFSv4.1 backchannel transport module.
[    0.215992] hw perfevents: enabled with armv7_cortex_a7 PMU driver, 7 counters available
[    0.219028] Initialise system trusted keyrings
[    0.219238] workingset: timestamp_bits=14 max_order=18 bucket_order=4
[    0.229056] FS-Cache: Netfs 'nfs' registered for caching
[    0.229657] NFS: Registering the id_resolver key type
[    0.229702] Key type id_resolver registered
[    0.229724] Key type id_legacy registered
[    0.229756] nfs4filelayout_init: NFSv4 File Layout Driver Registering...
[    0.232107] Key type asymmetric registered
[    0.232137] Asymmetric key parser 'x509' registered
[    0.232206] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 250)
[    0.232387] io scheduler noop registered
[    0.232412] io scheduler deadline registered (default)
[    0.232608] io scheduler cfq registered
[    0.232631] io scheduler mq-deadline registered (default)
[    0.232656] io scheduler kyber registered
[    0.235769] bcm2708_fb soc:fb: FB found 1 display(s)
[    0.244750] Console: switching to colour frame buffer device 82x26
[    0.251594] bcm2708_fb soc:fb: Registered framebuffer for display 0, size 656x416
[    0.258344] bcm2835-rng 3f104000.rng: hwrng registered
[    0.261034] vc-mem: phys_addr:0x00000000 mem_base=0x3ec00000 mem_size:0x40000000(1024 MiB)
[    0.266345] vc-sm: Videocore shared memory driver
[    0.269104] gpiomem-bcm2835 3f200000.gpiomem: Initialised: Registers at 0x3f200000
[    0.284927] brd: module loaded
[    0.297556] loop: module loaded
[    0.300607] Loading iSCSI transport class v2.0-870.
[    0.303786] libphy: Fixed MDIO Bus: probed
[    0.306299] usbcore: registered new interface driver lan78xx
[    0.308755] usbcore: registered new interface driver smsc95xx
[    0.311112] dwc_otg: version 3.00a 10-AUG-2012 (platform bus)
[    0.341396] dwc_otg 3f980000.usb: base=(ptrval)
[    0.544056] Core Release: 2.80a
[    0.546437] Setting default values for core params
[    0.548884] Finished setting default values for core params
[    0.751622] Using Buffer DMA mode
[    0.754031] Periodic Transfer Interrupt Enhancement - disabled
[    0.756458] Multiprocessor Interrupt Enhancement - disabled
[    0.758832] OTG VER PARAM: 0, OTG VER FLAG: 0
[    0.761179] Dedicated Tx FIFOs mode
[    0.763889] WARN::dwc_otg_hcd_init:1045: FIQ DMA bounce buffers: virt = b7904000 dma = 0xf7904000 len=9024
[    0.768470] FIQ FSM acceleration enabled for :
               Non-periodic Split Transactions
               Periodic Split Transactions
               High-Speed Isochronous Endpoints
               Interrupt/Control Split Transaction hack enabled
[    0.779382] dwc_otg: Microframe scheduler enabled
[    0.779440] WARN::hcd_init_fiq:457: FIQ on core 1
[    0.781667] WARN::hcd_init_fiq:458: FIQ ASM at 80655664 length 36
[    0.783879] WARN::hcd_init_fiq:497: MPHI regs_base at b8810000
[    0.786136] dwc_otg 3f980000.usb: DWC OTG Controller
[    0.788395] dwc_otg 3f980000.usb: new USB bus registered, assigned bus number 1
[    0.790714] dwc_otg 3f980000.usb: irq 56, io mem 0x00000000
[    0.793038] Init: Port Power? op_state=1
[    0.795279] Init: Power Port (0)
[    0.797697] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 4.19
[    0.802230] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    0.804645] usb usb1: Product: DWC OTG Controller
[    0.807009] usb usb1: Manufacturer: Linux 4.19.75-v7+ dwc_otg_hcd
[    0.809428] usb usb1: SerialNumber: 3f980000.usb
[    0.812394] hub 1-0:1.0: USB hub found
[    0.814667] hub 1-0:1.0: 1 port detected
[    0.817432] dwc_otg: FIQ enabled
[    0.817438] dwc_otg: NAK holdoff enabled
[    0.817444] dwc_otg: FIQ split-transaction FSM enabled
[    0.817454] Module dwc_common_port init
[    0.817750] usbcore: registered new interface driver usb-storage
[    0.820200] mousedev: PS/2 mouse device common for all mice
[    0.823406] bcm2835-wdt bcm2835-wdt: Broadcom BCM2835 watchdog timer
[    0.826033] bcm2835-cpufreq: min=600000 max=1200000
[    0.828861] sdhci: Secure Digital Host Controller Interface driver
[    0.831276] sdhci: Copyright(c) Pierre Ossman
[    0.834077] mmc-bcm2835 3f300000.mmcnr: could not get clk, deferring probe
[    0.836990] sdhost-bcm2835 3f202000.mmc: could not get clk, deferring probe
[    0.839670] sdhci-pltfm: SDHCI platform and OF driver helper
[    0.843765] ledtrig-cpu: registered to indicate activity on CPUs
[    0.846537] hidraw: raw HID events driver (C) Jiri Kosina
[    0.849307] usbcore: registered new interface driver usbhid
[    0.851961] usbhid: USB HID core driver
[    0.855271] vchiq: vchiq_init_state: slot_zero = (ptrval), is_master = 0
[    0.859395] [vc_sm_connected_init]: start
[    0.868111] [vc_sm_connected_init]: end - returning 0
[    0.871663] Initializing XFRM netlink socket
[    0.874125] NET: Registered protocol family 17
[    0.876621] Key type dns_resolver registered
[    0.879428] Registering SWP/SWPB emulation handler
[    0.882549] registered taskstats version 1
[    0.884955] Loading compiled-in X.509 certificates
[    0.894622] uart-pl011 3f201000.serial: cts_event_workaround enabled
[    0.897149] 3f201000.serial: ttyAMA0 at MMIO 0x3f201000 (irq = 81, base_baud = 0) is a PL011 rev2
[    0.904029] mmc-bcm2835 3f300000.mmcnr: mmc_debug:0 mmc_debug2:0
[    0.906563] mmc-bcm2835 3f300000.mmcnr: DMA channel allocated
[    0.935109] sdhost: log_buf @ (ptrval) (f7907000)
[    0.973663] mmc1: queuing unknown CIS tuple 0x80 (2 bytes)
[    0.977627] mmc1: queuing unknown CIS tuple 0x80 (3 bytes)
[    0.981485] mmc1: queuing unknown CIS tuple 0x80 (3 bytes)
[    0.983727] mmc0: sdhost-bcm2835 loaded - DMA enabled (>1)
[    0.987202] of_cfs_init
[    0.989448] of_cfs_init: OK
[    0.992078] Waiting for root device PARTUUID=6c586e13-02...
[    1.008306] mmc1: queuing unknown CIS tuple 0x80 (7 bytes)
[    1.031871] Indeed it is in host mode hprt0 = 00021501
[    1.102641] random: fast init done
[    1.127907] mmc0: host does not support reading read-only switch, assuming write-enable
[    1.134958] mmc0: new high speed SDHC card at address e624
[    1.138506] mmcblk0: mmc0:e624 SU04G 3.69 GiB
[    1.143145]  mmcblk0: p1 p2
[    1.164319] EXT4-fs (mmcblk0p2): INFO: recovery required on readonly filesystem
[    1.166692] EXT4-fs (mmcblk0p2): write access will be enabled during recovery
[    1.180012] mmc1: new high speed SDIO card at address 0001
[    1.241804] usb 1-1: new high-speed USB device number 2 using dwc_otg
[    1.244258] Indeed it is in host mode hprt0 = 00001101
[    1.482130] usb 1-1: New USB device found, idVendor=0424, idProduct=9514, bcdDevice= 2.00
[    1.486960] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    1.490366] hub 1-1:1.0: USB hub found
[    1.493169] hub 1-1:1.0: 5 ports detected
[    1.811784] usb 1-1.1: new high-speed USB device number 3 using dwc_otg
[    1.942030] usb 1-1.1: New USB device found, idVendor=0424, idProduct=ec00, bcdDevice= 2.00
[    1.947472] usb 1-1.1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    1.953035] smsc95xx v1.0.6
[    2.045167] smsc95xx 1-1.1:1.0 eth0: register 'smsc95xx' at usb-3f980000.usb-1.1, smsc95xx USB 2.0 Ethernet, b8:27:eb:89:fe:7c
[    2.461035] EXT4-fs (mmcblk0p2): recovery complete
[    2.467433] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
[    2.473295] VFS: Mounted root (ext4 filesystem) readonly on device 179:2.
[    2.485357] devtmpfs: mounted
[    2.493668] Freeing unused kernel memory: 1024K
[    2.496977] Run /sbin/init as init process
[    3.105285] systemd[1]: System time before build time, advancing clock.
[    3.242872] NET: Registered protocol family 10
[    3.247212] Segment Routing with IPv6
[    3.292559] systemd[1]: systemd 241 running in system mode. (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN2 +IDN -PCRE2 default-hierarchy=hybrid)
[    3.302261] systemd[1]: Detected architecture arm.
[    3.324693] systemd[1]: Set hostname to <octopi>.
[    3.336042] systemd[1]: Failed to bump fs.file-max, ignoring: Invalid argument
[    3.680655] systemd[1]: File /lib/systemd/system/systemd-journald.service:12 configures an IP firewall (IPAddressDeny=any), but the local system does not support BPF/cgroup based firewalling.
[    3.689145] systemd[1]: Proceeding WITHOUT firewalling in effect! (This warning is only shown for the first loaded unit using IP firewalling.)
[    4.164405] random: systemd: uninitialized urandom read (16 bytes read)
[    4.178628] random: systemd: uninitialized urandom read (16 bytes read)
[    4.182057] systemd[1]: Listening on initctl Compatibility Named Pipe.
[    4.188912] random: systemd: uninitialized urandom read (16 bytes read)
[    4.200391] systemd[1]: Listening on Syslog Socket.
[    4.207584] systemd[1]: Listening on udev Control Socket.
[    4.214377] systemd[1]: Listening on Journal Socket (/dev/log).
[    4.916328] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null)
[    5.065939] systemd-journald[106]: Received request to flush runtime journal from PID 1
[    5.621343] vc_sm_cma: module is from the staging directory, the quality is unknown, you have been warned.
[    5.624254] bcm2835_vc_sm_cma_probe: Videocore shared memory driver
[    5.624273] [vc_sm_connected_init]: start
[    5.627658] media: Linux media interface: v0.10
[    5.629219] [vc_sm_connected_init]: installed successfully
[    5.671609] videodev: Linux video capture interface: v2.00
[    5.801934] bcm2835_mmal_vchiq: module is from the staging directory, the quality is unknown, you have been warned.
[    5.802051] bcm2835_mmal_vchiq: module is from the staging directory, the quality is unknown, you have been warned.
[    5.812837] snd_bcm2835: module is from the staging directory, the quality is unknown, you have been warned.
[    5.829211] bcm2835_audio soc:audio: card created with 8 channels
[    5.830851] bcm2835_v4l2: module is from the staging directory, the quality is unknown, you have been warned.
[    5.839899] bcm2835_codec: module is from the staging directory, the quality is unknown, you have been warned.
[    5.973129] cfg80211: Loading compiled-in X.509 certificates for regulatory database
[    6.077761] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[    6.150884] brcmfmac: F1 signature read @0x18000000=0x1541a9a6
[    6.162041] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43430-sdio for chip BCM43430/1
[    6.162397] usbcore: registered new interface driver brcmfmac
[    6.366084] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43430-sdio for chip BCM43430/1
[    6.366173] brcmfmac: brcmf_c_process_clm_blob: no clm_blob available (err=-2), device may have limited channels available
[    6.366918] brcmfmac: brcmf_c_preinit_dcmds: Firmware: BCM43430/1 wl0: Oct 23 2017 03:55:53 version 7.45.98.38 (r674442 CY) FWID 01-e58d219f
[    6.473848] bcm2835-codec bcm2835-codec: Device registered as /dev/video10
[    6.473893] bcm2835-codec bcm2835-codec: Loaded V4L2 decode
[    6.479039] bcm2835-codec bcm2835-codec: Device registered as /dev/video11
[    6.479081] bcm2835-codec bcm2835-codec: Loaded V4L2 encode
[    6.483737] bcm2835-codec bcm2835-codec: Device registered as /dev/video12
[    6.483794] bcm2835-codec bcm2835-codec: Loaded V4L2 isp
[    7.911892] Under-voltage detected! (0x00050005)
[    8.374894] uart-pl011 3f201000.serial: no DMA platform data
[    8.492382] random: crng init done
[    8.492415] random: 7 urandom warning(s) missed due to ratelimiting
[    8.627884] 8021q: 802.1Q VLAN Support v1.8
[    8.830054] Adding 102396k swap on /var/swap.  Priority:-2 extents:1 across:102396k SSFS
[    9.145005] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[    9.145062] brcmfmac: power management disabled
[    9.604070] smsc95xx 1-1.1:1.0 eth0: hardware isn't capable of remote wakeup
[    9.604537] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[   11.971255] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[   13.595520] Bluetooth: Core ver 2.22
[   13.595606] NET: Registered protocol family 31
[   13.595614] Bluetooth: HCI device and connection manager initialized
[   13.595637] Bluetooth: HCI socket layer initialized
[   13.595651] Bluetooth: L2CAP socket layer initialized
[   13.595694] Bluetooth: SCO socket layer initialized
[   13.615253] Bluetooth: HCI UART driver ver 2.3
[   13.615267] Bluetooth: HCI UART protocol H4 registered
[   13.615390] Bluetooth: HCI UART protocol Three-wire (H5) registered
[   13.615634] Bluetooth: HCI UART protocol Broadcom registered
[   13.970598] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[   13.970612] Bluetooth: BNEP filters: protocol multicast
[   13.970641] Bluetooth: BNEP socket layer initialized
[   91.110232] Voltage normalised (0x00000000)
[   99.430059] Under-voltage detected! (0x00050005)
[  105.669857] Voltage normalised (0x00000000)
[  132.709676] Under-voltage detected! (0x00050005)
[  138.949691] Voltage normalised (0x00000000)
[  346.949936] rpi_firmware_get_throttled: 1 callbacks suppressed
[  346.949944] Under-voltage detected! (0x00050005)
[  373.989793] Under-voltage detected! (0x00050005)
[  401.029780] Under-voltage detected! (0x00050005)
[  405.189777] rpi_firmware_get_throttled: 3 callbacks suppressed
[  405.189784] Voltage normalised (0x00000000)
[  498.789843] Voltage normalised (0x00000000)
[  567.429770] Voltage normalised (0x00000000)
[  677.669775] rpi_firmware_get_throttled: 3 callbacks suppressed
[  677.669784] Under-voltage detected! (0x00050005)
[  690.149816] Under-voltage detected! (0x00050005)
[  700.549776] Under-voltage detected! (0x00050005)
[  708.869736] rpi_firmware_get_throttled: 3 callbacks suppressed
[  708.869743] Voltage normalised (0x00000000)

here is the dmesg with the printer connected.

pi@octopi:~ $ dmesg
[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 4.19.75-v7+ (dom@buildbot) (gcc version 4.9.3 (crosstool-NG crosstool-ng-1.22.0-88-g8460611)) #1270 SMP Tue Sep 24 18:45:11 BST 2019
[    0.000000] CPU: ARMv7 Processor [410fd034] revision 4 (ARMv7), cr=10c5383d
[    0.000000] CPU: div instructions available: patching division code
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[    0.000000] OF: fdt: Machine model: Raspberry Pi 3 Model B Rev 1.2
[    0.000000] Memory policy: Data cache writealloc
[    0.000000] cma: Reserved 8 MiB at 0x37800000
[    0.000000] On node 0 totalpages: 229376
[    0.000000]   Normal zone: 2016 pages used for memmap
[    0.000000]   Normal zone: 0 pages reserved
[    0.000000]   Normal zone: 229376 pages, LIFO batch:63
[    0.000000] random: get_random_bytes called from start_kernel+0xac/0x4b4 with crng_init=0
[    0.000000] percpu: Embedded 17 pages/cpu s39488 r8192 d21952 u69632
[    0.000000] pcpu-alloc: s39488 r8192 d21952 u69632 alloc=17*4096
[    0.000000] pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 227360
[    0.000000] Kernel command line: coherent_pool=1M 8250.nr_uarts=0 bcm2708_fb.fbwidth=656 bcm2708_fb.fbheight=416 bcm2708_fb.fbswap=1 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000  console=ttyS0,115200 console=tty1 root=PARTUUID=6c586e13-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait
[    0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
[    0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
[    0.000000] Memory: 886308K/917504K available (8192K kernel code, 629K rwdata, 2176K rodata, 1024K init, 821K bss, 23004K reserved, 8192K cma-reserved)
[    0.000000] Virtual kernel memory layout:
                   vector  : 0xffff0000 - 0xffff1000   (   4 kB)
                   fixmap  : 0xffc00000 - 0xfff00000   (3072 kB)
                   vmalloc : 0xb8800000 - 0xff800000   (1136 MB)
                   lowmem  : 0x80000000 - 0xb8000000   ( 896 MB)
                   modules : 0x7f000000 - 0x80000000   (  16 MB)
                     .text : 0x(ptrval) - 0x(ptrval)   (9184 kB)
                     .init : 0x(ptrval) - 0x(ptrval)   (1024 kB)
                     .data : 0x(ptrval) - 0x(ptrval)   ( 630 kB)
                      .bss : 0x(ptrval) - 0x(ptrval)   ( 822 kB)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
[    0.000000] ftrace: allocating 26399 entries in 78 pages
[    0.000000] rcu: Hierarchical RCU implementation.
[    0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
[    0.000000] arch_timer: cp15 timer(s) running at 19.20MHz (phys).
[    0.000000] clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0x46d987e47, max_idle_ns: 440795202767 ns
[    0.000007] sched_clock: 56 bits at 19MHz, resolution 52ns, wraps every 4398046511078ns
[    0.000023] Switching to timer-based delay loop, resolution 52ns
[    0.000293] Console: colour dummy device 80x30
[    0.000904] console [tty1] enabled
[    0.000962] Calibrating delay loop (skipped), value calculated using timer frequency.. 38.40 BogoMIPS (lpj=192000)
[    0.001008] pid_max: default: 32768 minimum: 301
[    0.001365] Mount-cache hash table entries: 2048 (order: 1, 8192 bytes)
[    0.001401] Mountpoint-cache hash table entries: 2048 (order: 1, 8192 bytes)
[    0.002338] CPU: Testing write buffer coherency: ok
[    0.002818] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
[    0.003485] Setting up static identity map for 0x100000 - 0x10003c
[    0.003653] rcu: Hierarchical SRCU implementation.
[    0.004462] smp: Bringing up secondary CPUs ...
[    0.005321] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
[    0.006250] CPU2: thread -1, cpu 2, socket 0, mpidr 80000002
[    0.007115] CPU3: thread -1, cpu 3, socket 0, mpidr 80000003
[    0.007237] smp: Brought up 1 node, 4 CPUs
[    0.007318] SMP: Total of 4 processors activated (153.60 BogoMIPS).
[    0.007341] CPU: All CPU(s) started in HYP mode.
[    0.007362] CPU: Virtualization extensions available.
[    0.008347] devtmpfs: initialized
[    0.021304] VFP support v0.3: implementor 41 architecture 3 part 40 variant 3 rev 4
[    0.021577] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[    0.021625] futex hash table entries: 1024 (order: 4, 65536 bytes)
[    0.022241] pinctrl core: initialized pinctrl subsystem
[    0.023123] NET: Registered protocol family 16
[    0.026034] DMA: preallocated 1024 KiB pool for atomic coherent allocations
[    0.031671] hw-breakpoint: found 5 (+1 reserved) breakpoint and 4 watchpoint registers.
[    0.031707] hw-breakpoint: maximum watchpoint size is 8 bytes.
[    0.031930] Serial: AMBA PL011 UART driver
[    0.034225] bcm2835-mbox 3f00b880.mailbox: mailbox enabled
[    0.069072] bcm2835-dma 3f007000.dma: DMA legacy API manager at (ptrval), dmachans=0x1
[    0.070998] SCSI subsystem initialized
[    0.071233] usbcore: registered new interface driver usbfs
[    0.071315] usbcore: registered new interface driver hub
[    0.071426] usbcore: registered new device driver usb
[    0.090294] raspberrypi-firmware soc:firmware: Attached to firmware from 2019-09-24 17:39, variant start_x
[    0.100128] raspberrypi-firmware soc:firmware: Firmware hash is 6820edeee4ef3891b95fc01cf02a7abd7ca52f17
[    0.111750] clocksource: Switched to clocksource arch_sys_counter
[    0.201400] VFS: Disk quotas dquot_6.6.0
[    0.201511] VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[    0.201688] FS-Cache: Loaded
[    0.201936] CacheFiles: Loaded
[    0.211925] NET: Registered protocol family 2
[    0.212716] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 6144 bytes)
[    0.212780] TCP established hash table entries: 8192 (order: 3, 32768 bytes)
[    0.212911] TCP bind hash table entries: 8192 (order: 4, 65536 bytes)
[    0.213115] TCP: Hash tables configured (established 8192 bind 8192)
[    0.213270] UDP hash table entries: 512 (order: 2, 16384 bytes)
[    0.213336] UDP-Lite hash table entries: 512 (order: 2, 16384 bytes)
[    0.213669] NET: Registered protocol family 1
[    0.214254] RPC: Registered named UNIX socket transport module.
[    0.214280] RPC: Registered udp transport module.
[    0.214302] RPC: Registered tcp transport module.
[    0.214324] RPC: Registered tcp NFSv4.1 backchannel transport module.
[    0.215992] hw perfevents: enabled with armv7_cortex_a7 PMU driver, 7 counters available
[    0.219028] Initialise system trusted keyrings
[    0.219238] workingset: timestamp_bits=14 max_order=18 bucket_order=4
[    0.229056] FS-Cache: Netfs 'nfs' registered for caching
[    0.229657] NFS: Registering the id_resolver key type
[    0.229702] Key type id_resolver registered
[    0.229724] Key type id_legacy registered
[    0.229756] nfs4filelayout_init: NFSv4 File Layout Driver Registering...
[    0.232107] Key type asymmetric registered
[    0.232137] Asymmetric key parser 'x509' registered
[    0.232206] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 250)
[    0.232387] io scheduler noop registered
[    0.232412] io scheduler deadline registered (default)
[    0.232608] io scheduler cfq registered
[    0.232631] io scheduler mq-deadline registered (default)
[    0.232656] io scheduler kyber registered
[    0.235769] bcm2708_fb soc:fb: FB found 1 display(s)
[    0.244750] Console: switching to colour frame buffer device 82x26
[    0.251594] bcm2708_fb soc:fb: Registered framebuffer for display 0, size 656x416
[    0.258344] bcm2835-rng 3f104000.rng: hwrng registered
[    0.261034] vc-mem: phys_addr:0x00000000 mem_base=0x3ec00000 mem_size:0x40000000(1024 MiB)
[    0.266345] vc-sm: Videocore shared memory driver
[    0.269104] gpiomem-bcm2835 3f200000.gpiomem: Initialised: Registers at 0x3f200000
[    0.284927] brd: module loaded
[    0.297556] loop: module loaded
[    0.300607] Loading iSCSI transport class v2.0-870.
[    0.303786] libphy: Fixed MDIO Bus: probed
[    0.306299] usbcore: registered new interface driver lan78xx
[    0.308755] usbcore: registered new interface driver smsc95xx
[    0.311112] dwc_otg: version 3.00a 10-AUG-2012 (platform bus)
[    0.341396] dwc_otg 3f980000.usb: base=(ptrval)
[    0.544056] Core Release: 2.80a
[    0.546437] Setting default values for core params
[    0.548884] Finished setting default values for core params
[    0.751622] Using Buffer DMA mode
[    0.754031] Periodic Transfer Interrupt Enhancement - disabled
[    0.756458] Multiprocessor Interrupt Enhancement - disabled
[    0.758832] OTG VER PARAM: 0, OTG VER FLAG: 0
[    0.761179] Dedicated Tx FIFOs mode
[    0.763889] WARN::dwc_otg_hcd_init:1045: FIQ DMA bounce buffers: virt = b7904000 dma = 0xf7904000 len=9024
[    0.768470] FIQ FSM acceleration enabled for :
               Non-periodic Split Transactions
               Periodic Split Transactions
               High-Speed Isochronous Endpoints
               Interrupt/Control Split Transaction hack enabled
[    0.779382] dwc_otg: Microframe scheduler enabled
[    0.779440] WARN::hcd_init_fiq:457: FIQ on core 1
[    0.781667] WARN::hcd_init_fiq:458: FIQ ASM at 80655664 length 36
[    0.783879] WARN::hcd_init_fiq:497: MPHI regs_base at b8810000
[    0.786136] dwc_otg 3f980000.usb: DWC OTG Controller
[    0.788395] dwc_otg 3f980000.usb: new USB bus registered, assigned bus number 1
[    0.790714] dwc_otg 3f980000.usb: irq 56, io mem 0x00000000
[    0.793038] Init: Port Power? op_state=1
[    0.795279] Init: Power Port (0)
[    0.797697] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 4.19
[    0.802230] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    0.804645] usb usb1: Product: DWC OTG Controller
[    0.807009] usb usb1: Manufacturer: Linux 4.19.75-v7+ dwc_otg_hcd
[    0.809428] usb usb1: SerialNumber: 3f980000.usb
[    0.812394] hub 1-0:1.0: USB hub found
[    0.814667] hub 1-0:1.0: 1 port detected
[    0.817432] dwc_otg: FIQ enabled
[    0.817438] dwc_otg: NAK holdoff enabled
[    0.817444] dwc_otg: FIQ split-transaction FSM enabled
[    0.817454] Module dwc_common_port init
[    0.817750] usbcore: registered new interface driver usb-storage
[    0.820200] mousedev: PS/2 mouse device common for all mice
[    0.823406] bcm2835-wdt bcm2835-wdt: Broadcom BCM2835 watchdog timer
[    0.826033] bcm2835-cpufreq: min=600000 max=1200000
[    0.828861] sdhci: Secure Digital Host Controller Interface driver
[    0.831276] sdhci: Copyright(c) Pierre Ossman
[    0.834077] mmc-bcm2835 3f300000.mmcnr: could not get clk, deferring probe
[    0.836990] sdhost-bcm2835 3f202000.mmc: could not get clk, deferring probe
[    0.839670] sdhci-pltfm: SDHCI platform and OF driver helper
[    0.843765] ledtrig-cpu: registered to indicate activity on CPUs
[    0.846537] hidraw: raw HID events driver (C) Jiri Kosina
[    0.849307] usbcore: registered new interface driver usbhid
[    0.851961] usbhid: USB HID core driver
[    0.855271] vchiq: vchiq_init_state: slot_zero = (ptrval), is_master = 0
[    0.859395] [vc_sm_connected_init]: start
[    0.868111] [vc_sm_connected_init]: end - returning 0
[    0.871663] Initializing XFRM netlink socket
[    0.874125] NET: Registered protocol family 17
[    0.876621] Key type dns_resolver registered
[    0.879428] Registering SWP/SWPB emulation handler
[    0.882549] registered taskstats version 1
[    0.884955] Loading compiled-in X.509 certificates
[    0.894622] uart-pl011 3f201000.serial: cts_event_workaround enabled
[    0.897149] 3f201000.serial: ttyAMA0 at MMIO 0x3f201000 (irq = 81, base_baud = 0) is a PL011 rev2
[    0.904029] mmc-bcm2835 3f300000.mmcnr: mmc_debug:0 mmc_debug2:0
[    0.906563] mmc-bcm2835 3f300000.mmcnr: DMA channel allocated
[    0.935109] sdhost: log_buf @ (ptrval) (f7907000)
[    0.973663] mmc1: queuing unknown CIS tuple 0x80 (2 bytes)
[    0.977627] mmc1: queuing unknown CIS tuple 0x80 (3 bytes)
[    0.981485] mmc1: queuing unknown CIS tuple 0x80 (3 bytes)
[    0.983727] mmc0: sdhost-bcm2835 loaded - DMA enabled (>1)
[    0.987202] of_cfs_init
[    0.989448] of_cfs_init: OK
[    0.992078] Waiting for root device PARTUUID=6c586e13-02...
[    1.008306] mmc1: queuing unknown CIS tuple 0x80 (7 bytes)
[    1.031871] Indeed it is in host mode hprt0 = 00021501
[    1.102641] random: fast init done
[    1.127907] mmc0: host does not support reading read-only switch, assuming write-enable
[    1.134958] mmc0: new high speed SDHC card at address e624
[    1.138506] mmcblk0: mmc0:e624 SU04G 3.69 GiB
[    1.143145]  mmcblk0: p1 p2
[    1.164319] EXT4-fs (mmcblk0p2): INFO: recovery required on readonly filesystem
[    1.166692] EXT4-fs (mmcblk0p2): write access will be enabled during recovery
[    1.180012] mmc1: new high speed SDIO card at address 0001
[    1.241804] usb 1-1: new high-speed USB device number 2 using dwc_otg
[    1.244258] Indeed it is in host mode hprt0 = 00001101
[    1.482130] usb 1-1: New USB device found, idVendor=0424, idProduct=9514, bcdDevice= 2.00
[    1.486960] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    1.490366] hub 1-1:1.0: USB hub found
[    1.493169] hub 1-1:1.0: 5 ports detected
[    1.811784] usb 1-1.1: new high-speed USB device number 3 using dwc_otg
[    1.942030] usb 1-1.1: New USB device found, idVendor=0424, idProduct=ec00, bcdDevice= 2.00
[    1.947472] usb 1-1.1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    1.953035] smsc95xx v1.0.6
[    2.045167] smsc95xx 1-1.1:1.0 eth0: register 'smsc95xx' at usb-3f980000.usb-1.1, smsc95xx USB 2.0 Ethernet, b8:27:eb:89:fe:7c
[    2.461035] EXT4-fs (mmcblk0p2): recovery complete
[    2.467433] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
[    2.473295] VFS: Mounted root (ext4 filesystem) readonly on device 179:2.
[    2.485357] devtmpfs: mounted
[    2.493668] Freeing unused kernel memory: 1024K
[    2.496977] Run /sbin/init as init process
[    3.105285] systemd[1]: System time before build time, advancing clock.
[    3.242872] NET: Registered protocol family 10
[    3.247212] Segment Routing with IPv6
[    3.292559] systemd[1]: systemd 241 running in system mode. (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN2 +IDN -PCRE2 default-hierarchy=hybrid)
[    3.302261] systemd[1]: Detected architecture arm.
[    3.324693] systemd[1]: Set hostname to <octopi>.
[    3.336042] systemd[1]: Failed to bump fs.file-max, ignoring: Invalid argument
[    3.680655] systemd[1]: File /lib/systemd/system/systemd-journald.service:12 configures an IP firewall (IPAddressDeny=any), but the local system does not support BPF/cgroup based firewalling.
[    3.689145] systemd[1]: Proceeding WITHOUT firewalling in effect! (This warning is only shown for the first loaded unit using IP firewalling.)
[    4.164405] random: systemd: uninitialized urandom read (16 bytes read)
[    4.178628] random: systemd: uninitialized urandom read (16 bytes read)
[    4.182057] systemd[1]: Listening on initctl Compatibility Named Pipe.
[    4.188912] random: systemd: uninitialized urandom read (16 bytes read)
[    4.200391] systemd[1]: Listening on Syslog Socket.
[    4.207584] systemd[1]: Listening on udev Control Socket.
[    4.214377] systemd[1]: Listening on Journal Socket (/dev/log).
[    4.916328] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null)
[    5.065939] systemd-journald[106]: Received request to flush runtime journal from PID 1
[    5.621343] vc_sm_cma: module is from the staging directory, the quality is unknown, you have been warned.
[    5.624254] bcm2835_vc_sm_cma_probe: Videocore shared memory driver
[    5.624273] [vc_sm_connected_init]: start
[    5.627658] media: Linux media interface: v0.10
[    5.629219] [vc_sm_connected_init]: installed successfully
[    5.671609] videodev: Linux video capture interface: v2.00
[    5.801934] bcm2835_mmal_vchiq: module is from the staging directory, the quality is unknown, you have been warned.
[    5.802051] bcm2835_mmal_vchiq: module is from the staging directory, the quality is unknown, you have been warned.
[    5.812837] snd_bcm2835: module is from the staging directory, the quality is unknown, you have been warned.
[    5.829211] bcm2835_audio soc:audio: card created with 8 channels
[    5.830851] bcm2835_v4l2: module is from the staging directory, the quality is unknown, you have been warned.
[    5.839899] bcm2835_codec: module is from the staging directory, the quality is unknown, you have been warned.
[    5.973129] cfg80211: Loading compiled-in X.509 certificates for regulatory database
[    6.077761] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[    6.150884] brcmfmac: F1 signature read @0x18000000=0x1541a9a6
[    6.162041] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43430-sdio for chip BCM43430/1
[    6.162397] usbcore: registered new interface driver brcmfmac
[    6.366084] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43430-sdio for chip BCM43430/1
[    6.366173] brcmfmac: brcmf_c_process_clm_blob: no clm_blob available (err=-2), device may have limited channels available
[    6.366918] brcmfmac: brcmf_c_preinit_dcmds: Firmware: BCM43430/1 wl0: Oct 23 2017 03:55:53 version 7.45.98.38 (r674442 CY) FWID 01-e58d219f
[    6.473848] bcm2835-codec bcm2835-codec: Device registered as /dev/video10
[    6.473893] bcm2835-codec bcm2835-codec: Loaded V4L2 decode
[    6.479039] bcm2835-codec bcm2835-codec: Device registered as /dev/video11
[    6.479081] bcm2835-codec bcm2835-codec: Loaded V4L2 encode
[    6.483737] bcm2835-codec bcm2835-codec: Device registered as /dev/video12
[    6.483794] bcm2835-codec bcm2835-codec: Loaded V4L2 isp
[    7.911892] Under-voltage detected! (0x00050005)
[    8.374894] uart-pl011 3f201000.serial: no DMA platform data
[    8.492382] random: crng init done
[    8.492415] random: 7 urandom warning(s) missed due to ratelimiting
[    8.627884] 8021q: 802.1Q VLAN Support v1.8
[    8.830054] Adding 102396k swap on /var/swap.  Priority:-2 extents:1 across:102396k SSFS
[    9.145005] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[    9.145062] brcmfmac: power management disabled
[    9.604070] smsc95xx 1-1.1:1.0 eth0: hardware isn't capable of remote wakeup
[    9.604537] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[   11.971255] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[   13.595520] Bluetooth: Core ver 2.22
[   13.595606] NET: Registered protocol family 31
[   13.595614] Bluetooth: HCI device and connection manager initialized
[   13.595637] Bluetooth: HCI socket layer initialized
[   13.595651] Bluetooth: L2CAP socket layer initialized
[   13.595694] Bluetooth: SCO socket layer initialized
[   13.615253] Bluetooth: HCI UART driver ver 2.3
[   13.615267] Bluetooth: HCI UART protocol H4 registered
[   13.615390] Bluetooth: HCI UART protocol Three-wire (H5) registered
[   13.615634] Bluetooth: HCI UART protocol Broadcom registered
[   13.970598] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[   13.970612] Bluetooth: BNEP filters: protocol multicast
[   13.970641] Bluetooth: BNEP socket layer initialized
[   91.110232] Voltage normalised (0x00000000)
[   99.430059] Under-voltage detected! (0x00050005)
[  105.669857] Voltage normalised (0x00000000)
[  132.709676] Under-voltage detected! (0x00050005)
[  138.949691] Voltage normalised (0x00000000)
[  346.949936] rpi_firmware_get_throttled: 1 callbacks suppressed
[  346.949944] Under-voltage detected! (0x00050005)
[  373.989793] Under-voltage detected! (0x00050005)
[  401.029780] Under-voltage detected! (0x00050005)
[  405.189777] rpi_firmware_get_throttled: 3 callbacks suppressed
[  405.189784] Voltage normalised (0x00000000)
[  498.789843] Voltage normalised (0x00000000)
[  567.429770] Voltage normalised (0x00000000)
[  677.669775] rpi_firmware_get_throttled: 3 callbacks suppressed
[  677.669784] Under-voltage detected! (0x00050005)
[  690.149816] Under-voltage detected! (0x00050005)
[  700.549776] Under-voltage detected! (0x00050005)
[  708.869736] rpi_firmware_get_throttled: 3 callbacks suppressed
[  708.869743] Voltage normalised (0x00000000)
[  746.309751] Voltage normalised (0x00000000)

I'd start by properly powering the Pi with a bonafide 5V @ 2.5A power adapter.

The two dmesg outputs are identical which means to me that the printer was not recognized. The "Under-voltage detected!" messages in both outputs may or may not be causing the missing printer, but it will cause lots of other problems down the line if its not fixed.

okay. so, we are using the original PI power adapter. is that not good enough?
I appreciate the help.

Since you have those errors with both the printer unplugged and plugged in, I think it's safe to assume that your original PI power adapter is probably to blame. They do fail occasionally.

Some printers will (improperly) draw power through the USB cable. If you only had low voltage when the printer was plugged in, then that might be the cause.