[QUESTION] After compiling the MINI firmware 6.1.2- LOAD/UNLOAD speed is too high - could someone point me in right direction?

[Czarnyszarf]

Question

Hello

I compiled the 6.1.2 firmware for the MINI with a few lines added to enable back the M852 skew command (I used the old snake firmware as template what to change).

Changing filament movements happens far faster than intended. For example, when loading filament, the process of purging after loading the filament to the hotend can happen within a second as the speed is set extremely fast.
The bug happens during and after printing. To fix it, you need to restart the printer and do the filament change, it seems that somehow the printer reads wrong variables or assumes the fastest feedrate available.

I tried changing the gcode in "filament_unload_ramming_sequence" but compiling it gave me errors, I suspect the way to temporary fix the issue is hardcoding the excac macro with speeds set instead of variables.

What file should I change?

327320796-2b8d6efe-3bc6-42cd-a2a2-8bf22519761b.mp4

[CZDanol]

Hey, have you tried FILAMENT_UNLOAD_PURGE_FEEDRATE?

Might be also for example an issue of wrong estep value

[CZDanol]

What all did you change compared to the 6.1.2? A patch/fork/whatever would be nice.

[Czarnyszarf]

Hi

I copied the changes from snake firmware winch enabled the M852 command, changes were done in this commit: Snake-Edition/P32-FW@be86dbb

I downloaded the original 6.1.2 firmware and just edited the files on images. Nothing else was edited.

After flashing the printer , m852 skew correction works correctly, but somehow filament change doesn’t work.

FILAMENT_UNLOAD_PURGE_FEEDRATE - it is set to 35 as the file is original from this repo , yet the filament change command ignores it

[CZDanol]

Hmm, weird. And without your changes, it works normally?