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Calibration fail after print
Closed, ResolvedPublic

Description

To reproduce:

  1. Start a print
  2. Let print finish or abort it
  3. Start a calibration test (menu -> advanced settings -> nozzle offsets -> measure automatically)

Running a calibration after a print can lead to disastrous results. If I complete (or cancel) a print, doing a follow up calibration has always led to bad results, whether it's just being far off center of the cube or missing the cube entirely. If it completes the calibration (with bad results) and I do a second calibration, it continues to do a bad calibration.

Power cycling the printer and then doing a calibration seems to be the only way to get a good calibration, then repeating the calibration test will repeat good results. It's only after starting a print job then running calibration that will lead to undesired results.

My conclusion is that some value(s) is changed after a print that affects the calibration test.

Event Timeline

matth created this task.Feb 12 2019, 10:31 AM
matth triaged this task as Normal priority.
marcio added a subscriber: marcio.Feb 12 2019, 11:04 AM

@matth: I suspect it's the bed leveling that remains enabled after a print. Can you run "M420 S0" from the console after the first print and see if it restores your ability to calibrate? If it does, it would be an easy fix for me to do that prior to the auto-calibration.

Can you send me the GCODE from a print that is exhibiting the problem?

Nevermind. I am able to reproduce it.

matth added a comment.Feb 12 2019, 1:58 PM

Oh good. I was waiting for my current print to finish before using that command. I've tested it with several difference gcodes and got similar bad results. I first noticed it after printing:

matth added a comment.Feb 12 2019, 2:41 PM

I tested it three times, and that seems to fix the issue.

marcio closed this task as Resolved.Feb 13 2019, 3:12 PM
marcio claimed this task.

@matth: The fix is baked in to .87