Jerk & acceleration value change after Resume APF

Phaedrux

Can you verify if the behaviour is the same in 3.4.6?

R006

@Phaedrux We have already verified with 3.4.6 and 3.4beta3, and same thing is happening.

dc42

@R006 the generated resurrect.g file does not currently restore the M204 acceleration settings or the jerk settings. Feel free to create an issue at https://github.com/Duet3D/RepRapFirmware/issues.

T3P3Tony

@R006 to be clear, the reported values after a restore after power failure are the ones you have set in config.g?

R006

@T3P3Tony
no in config Acceleration is 3000mm/s2 and jerk is 300mm/s.

T3P3Tony

@R006 ok so are the values that are restored related to anything in your settings or gcode file?

JayT

@T3P3Tony :

I use this version too and have observed same problems. The value of acceleration on resume is not something I am able to trace from gcode file or config. Its some random very high value like 20000 or 50000. even jerk changes.

I have also observed, that despite setting max acceleration & speeds in config, its not limited on resume after power failure. Can you check this?

dc42

@JayT @R006 in the forthcoming 3.5.0-rc.4 the M204 acceleration settings are restored when resuming after power fail.

JayT

@dc42 :

Noted.
However, there are 2 more errors that appear on resume:
a) tool0 was not driven because its heater temperature were not high enough. heater fault. Yet it resumes, but why this error?

b) Loading the heightmap before setting duetZ0 - warning,

dc42

@JayT regarding (a) it's your responsibility to use M116 or a similar command in your resurrect-prologue.g file to wait for temperatures to be reached. Are you doing that?

JayT

@dc42 :

My resurrect-prologue.g file is as below, it has M116 to wait.
;rel
G91
G1 Z2
G28 X Y
;wait
M116
;rel
M83
M21 P1
G1 E5 F500
;mesh
G29 S1
;Buzz
M300 S600 P100
;Buzz
M300 S700 P1200
;Buzz
M300 S500 P300
;Abs
G90

R006

@dc42 hey,

After upgrading to the latest firmware version 3.5.0rc4, we observed improvement in print acceleration settings. However, the travel acceleration is taking random value: while print acceleration seems to be functioning correctly, travel acceleration values are fluctuating unexpectedly.

dc42

@R006 please check whether the M204 command in resurrect.g is setting the correct travel acceleration for resuming the print.

JayT

@dc42 :

with RC4, sometimes it resumes fine with minimal offset. Whereas sometimes it shift by 5-8mm in Y direction for me on resume after power failure. Mostly it shifting by >5mm happens when print height is <5mm. So i disabled meshbed compensation & tried. It still has the same problem.

There are instances when even at height 3mm, it resumes fine.
skew in YZ is included. Does that have any effect?

What should I check for ?
Shift is always in Y axis & amount of shift is more w.r.t X axis.