Monoprice Mini Delta V2

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1

What is the problem?

On my Mac, I can use Octoprint just fine. This is because I can access the printer easily by doing screen /dev/cu.usbserial-1440 115200 and I can send and view stuff. On my raspberry pi 4 however I cannot.

What did you already try to solve it?

  • I have tried several cables. I know that certain ones work because when I plug them into my Mac, the printer works
  • I have a known good power supply that outputs 5v 2 amps.
  • I have tried running octoprint on a basic linux machine (same problem).
  • I have tried and am using the plugin for Malyan/Monoprice Connection Fix (0.1.3)

Logs (without plugin)

Changing monitoring state from "Offline" to "Opening serial connection"
Connecting to port /dev/ttyUSB0, baudrate 115200
Changing monitoring state from "Opening serial connection" to "Connecting"
Connected to: Serial<id=0xae702af0, open=True>(port='/dev/ttyUSB0', baudrate=115200, bytesize=8, parity='N', stopbits=1, timeout=10.0, xonxoff=False, rtscts=False, dsrdtr=False), starting monitor
Send: N0 M110 N0*125
No answer from the printer within the connection timeout, trying another hello
Send: N0 M110 N0*125
There was a timeout while trying to connect to the printer
Changing monitoring state from "Connecting" to "Offline"
Connection closed, closing down monitor

Logs (with Plugin):

Changing monitoring state from "Offline" to "Opening serial connection"
Connecting to: /dev/ttyUSB0
Using Malyan/Monoprice Connection Fix Plugin to create serial connection
Changing monitoring state from "Opening serial connection" to "Connecting"
Connected to: Serial<id=0xaccd4930, open=True>(port='/dev/ttyUSB0', baudrate=115200, bytesize=8, parity='N', stopbits=1, timeout=10.0, xonxoff=False, rtscts=False, dsrdtr=False), starting monitor
Send: N0 M110 N0*125
No answer from the printer within the connection timeout, trying another hello
Send: N0 M110 N0*125
There was a timeout while trying to connect to the printer
Changing monitoring state from "Connecting" to "Offline"
Connection closed, closing down monitor

I can see this on the device:

pi@octopi:~ $ cat /dev/ttyUSB0
�start
echo:PowerUp
Marlin 1.1.5

If I echo stuff to the device I get nothing:

pi@octopi:~ $ echo "N0 M110 N0*125" >> /dev/ttyUSB0
pi@octopi:~ $

I just ordered a new raspberry pi 3 to see if maybe something changed between them to cause this issue.

Have you tried running in safe mode?

Yes.

Did running in safe mode solve the problem?

No

Systeminfo Bundle

browser.user_agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:91.0) Gecko/20100101 Firefox/91.0
connectivity.connection_check: 1.1.1.1:53
connectivity.connection_ok: true
connectivity.enabled: true
connectivity.online: true
connectivity.resolution_check: octoprint.org
connectivity.resolution_ok: true
env.hardware.cores: 4
env.hardware.freq: 1500
env.hardware.ram: 3959984128
env.os.bits: 32
env.os.id: linux
env.os.platform: linux
env.plugins.pi_support.model: Raspberry Pi 4 Model B Rev 1.1
env.plugins.pi_support.octopi_version: 0.18.0
env.plugins.pi_support.throttle_state: 0x0
env.python.pip: 20.3.3
env.python.version: 3.7.3
env.python.virtualenv: true
octoprint.safe_mode: false
octoprint.version: 1.6.1
systeminfo.generator: systemapi

2

Solution: I'm going to return this and buy a different printer. I ran into a second and more fun issue:

Whenever I would try to use the SD card directly to print stuff (my machine would go to sleep and the print would die) it would not print the sliced model and then it would corrupt the file too! Good stuff. I'm done.

3

I'm in your boat.
I cannot find out how to manually send and receive serial commands at 115200/N/8/1 from Windows (Putty) or an Octopi (SSH screen or cat), but can from MacOS (minicom).
It shows up as COM7 on my Windows PC (confirmed that when I unplug COM7 goes away, plug in it comes back).

Interestingly, in Windows the Wiibuilder app can serial connect to the printer and read data back.
I both sniffed the serial port and debug stepped through the C# app and still don't understand why Windows Putty or Octopi screen won't trigger data flow (but Windows Wiibuilder and MacOS can).
Here is some of its output:

M105
ok T:34.45 /0.00 B:24.06 /0.00 C:23.32 /0.00 @:0 B@:0
N1 M110 N1*125
ok
N2 M114*37
X:0.00 Y:0.00 Z:119.76 ...

Still workin on it, but it is 1am so I am going to get some Zs.

4

Just in case anyone stumbles here (like I did), updating the ch341.ko driver will get the RPi and Octoprint to talk to the MP Mini Delta v2.

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