Rat Rig Community [Unofficial]•11mo ago

Hard machine limits ignored by gcode

Maybe I need an explanation. I considered the machine limits set in the printer.cfg as hard and absolute limits. Usually these limits are set higher than the sliced gcode, so no probbs. No I wanted to testrun a gcode slower, set the machine limits to half the former speed and started the gcode. Well, apparently, the accs of the gcode counted and overwrote the machine limits. Is that actually correct?

Solution:

klipper max_accel is overridden by M204 (which sets max accel). Yes, see: https://www.klipper3d.org/Config_Reference.html#printer ``` max_accel: Maximum acceleration (in mm/s^2) of the toolhead (relative to the...

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Solution

miklschmidt•11mo ago

klipper max_accel is overridden by M204 (which sets max accel). Yes, see: https://www.klipper3d.org/Config_Reference.html#printer

max_accel:
#   Maximum acceleration (in mm/s^2) of the toolhead (relative to the
#   print). Although this parameter is described as a "maximum"
#   acceleration, in practice most moves that accelerate or decelerate
#   will do so at the rate specified here. The value specified here
#   may be changed at runtime using the SET_VELOCITY_LIMIT command.
#   This parameter must be specified.

max_accel:
#   Maximum acceleration (in mm/s^2) of the toolhead (relative to the
#   print). Although this parameter is described as a "maximum"
#   acceleration, in practice most moves that accelerate or decelerate
#   will do so at the rate specified here. The value specified here
#   may be changed at runtime using the SET_VELOCITY_LIMIT command.
#   This parameter must be specified.

M204 S10000 = SET_VELOCITY_LIMIT ACCEL=10000

miklschmidt•11mo ago

Also generic klipper questions are better suited for #klipper

huskyteOP•11mo ago

Ok, thanks for the explanation. So, I need to use PrusaSlicer more carefully, when doing something like this

miklschmidt•11mo ago

Yeah just use the "advanced acceleration control" as it was intended ie, set it to the acceleration you want to use, if you want it changed, reslice.

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Hard machine limits ignored by gcode