I have installed the recover from a power failure addon

Plugins
1

Hi all

I have been printing 4 day print and it has died. power failure is allowing me to start were I left of. Well not quiet is restarts 10 mm higher is there a setting that will allow the print to restart the same distance from the bed as it left off?

Thanks
Shanta

2

I haven't used the plugin yet - but I guess it's this setting:

Critical: Determine if your printer has Z_HOMING_HEIGHT set. This setting raises the Z-axis on any homing event to avoid collisions. You can check your printer firmware configuration or in a resting state issue the command G28 X0 Y0 in the command terminal and observe if the Z-axis is raised, and by how much. This value is used for Z_HOMING_HEIGHT.

1 Like
3

I have never used octo print at this level before. The stalled print is siting on the bed. So I don't want to get in the way of resuming the print.
Here is what I have done I have changed values in Z_HOMING_HEIGHT for 10 to 0, -10, -20, -50 No change in the high above the print.

If I send G28 X0 Y0in the command window will that move the print head to 0 0 and additional 10 above? will it negatively effect the resume coordinates?
Thanks for the input.

4

It really depends in your printers firmware.

Negative values should lover the printhead after leveling. But thats just an educated guess - I never used the plugin before

5

This is not the way the plugin works. You need to install the plugin and set Z_HOMING_HEIGHT before you start printing. If there is a powerfailure or a printer disconnect, once the printer is reconnected it will generate a recovery_gcodefilename.gcode. If you don't have that recovery file already, there is nothing that can be done with your current print (other than measuring manually and editing gcode by hand).

6

I don't recall instructions on that when installing. I should have tested on a test print first.
I have never edited the gcode file.
So what code in the file should I move the starting Z height down? I think I must have the recovery file as the print is attempting to resume Would that File in the same directory as the original? Can I do that within OctoPrint?
On future prints. If the do I change the Z_HOMING_HEIGHT from 10 to 0 to get it to resume on the line it left of at?
Do appreciate the learning importunity.

Shanta

7

I fixed the problem though It was the hard way. I started a small print after adjusting the z offset in Power failure config. I tried using a negative number but that raised the Z offset up.
To test each value I powered down the printer and powered up. This created the recovery file.
I ended up with a plus number that now starts right on the proper Z coordinate.

I attempted to edit the recovery gcode but no changing of the file had any real effect. So I lost the 4 day print. I started again with the settings in power failure that appear to work.
Any ideas why editing the had no effect would be appreciated.

appreciate the input
Bee Happy
Shanta

8

I kinda have the same problem. I had this plugin installed but had a wrong Z_HOMING_HEIGHT in my configuration. After a power failure i have the problem that the printer starts 10mm above the actual print. I dig into the gcode file and changed the following line:

G1 Z-0.0 F200 ; correcting Z_HOMING_HEIGHT

to this here:

G1 Z-10.0 F200 ; correcting Z_HOMING_HEIGHT

and for the first layer the printer starts at the correct height. But after this layer he again shifts back 10mm up. The only thing that I dont understand is why is he jumping z up at this gcode?

;LAYER:558
M204 S500
;TYPE:WALL-INNER
;MESH:voronoi_easter_bunny_big_Z197.88mm.stl
G1 F1500 X32.889 Y44.015 E209.86546
G1 X32.913 Y43.557 E209.88071
9

You should not have to edit any gcode manually. The instructions state (clearly, IMO) that if your printer raises 10mm on homing X or Y, just put 10 in the Z_HOMING_HEIGHT setting box and it will correct for the height in the recovery gcode.

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10

I faced the same issues with power loss recovery on my Ender 3 V3 SE and have successfully configured it with the help of the Power Loss Plugin. Here's a summary of what I learned and how I solved the problems:

Power Loss Plugin Configuration for Ender 3 V3 SE (OctoPrint Setup)

Scenario 1: Actual Power Loss Occurs

  • Behavior: If the power goes out, the printer will automatically raise the print head by 10 mm when a new print is started through OctoPrint. This ensures the print head doesn't interfere with the print bed once the power is restored.

Scenario 2: No Power Loss (Power Remains On) and OctoPrint Disconnects

  • Behavior: If OctoPrint disconnects and reconnects without a power loss, the print head stays at the last saved Z height.

Scenario 3: OctoPrint Powered Out

  • Behavior: If OctoPrint loses power, it might cause a disconnection. After reconnecting, the print will resume with the head staying at the last saved Z height.

Scenario 4: Both Printer and OctoPrint Lose Power

  • Behavior: If both lose power, the print head will raise by 10 mm upon starting a new print, similar to Scenario 1.

Final Setup Recommendation

  • To avoid frequent reconfiguration, intentionally turn off the printer and create Scenario 1. This ensures that the print head raises by 10 mm when a new print starts and gives reliable recovery behavior.

Configuration

Set the Z Homing value to 10 mm in the Power Loss plugin configuration to ensure the printer moves the head appropriately on print restart:

G92 Z{adjustedZ}  ; set Z with any homing offsets 
;M211 S0 ; Deactivate software endstops
G91 ;relative positioning
G1 Z-{z_homing_height} F200 ; correcting Z_HOMING_HEIGHT
G90 ;absolute positioning
;M211 S1 ; Activate software endstops
  • Note: Avoid moving the printer head manually during recovery. Let the head remain in its position to avoid print failure.

Important Notes:

  • After any power loss, turn off the printer and then back on. Use the recovery G-code to ensure proper recovery.
  • You can adjust the recovery G-code based on your settings, but always ensure Scenario 1 is set up to minimize configuration changes.

For detailed steps, check out the guide I created: OctoPrint Power Loss Configuration Guide

This solution worked well for me, and I hope it helps others with similar issues!