Coming from Marlin 1.1.8, I tried to move over to Marlin 2.0.9.x but got an irratic behaviour of G29 on lineair bed leveling.All normal moves go well until G29 tries to lift Z 15 milimeters higher after the first probing. My Z motors stall and make a loud noise. Looks like the feedrate is much to high. My normal Z feedrate (A4988, running M5 leadscrews) is 8 mm/s and is working very well. My max Z acceleration is 20 mm/s. I found a message on this forum that stated that it was something within the G29 process and that is was impossible to solve in configuration.h or configuration_adv.h. Seems odd to me this has not been adressed and leads me to the thought I'm doing something very wrong here. Can anyone shed a light on this?

In configuration.h, change HOMING_FEEDRATE_MM_M to match your old firmware.

I wish it was as simple as that, but my HOMING_FEEDRATE_MM_M for Z is 1*60, so that should be low enough, and changing this does not affect the G29 behaviour. Z homing (issued by octoprint) is behaving as expected. More and more I believe its a setting in probe.cpp....

Update 031023: problem solved. It appeared the Z max feedrate of 8 mm/s was way to high. I reduced it to 2 and all is well now!

But thanx for the response anyway!

Edited 1 time(s). Last edit at 10/03/2023 06:23AM by going-down.