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I'm transforming my Anet A8 printer to Raspberry Pi driven using PyCNC. Things seem to look promising so far apart from the Z motor doing nothing but making screaming-like sound when supposed to be moving (In pycnc enter command z10).

I was playing with the config, changed the Z related velocity and step values. Didn't see any difference.

When I start pycnc and enter command g28 (all axis home) the Z needs some help... Here is a video.

Has anyone got experience in PyCNC? Or any idea?

0scar
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haxpanel
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    That sounds like you're trying to use too much acceleration (the *really* relevant thing in kinematics rather than velocity), but it seems you can only set that for all axes at the same time. – towe Sep 19 '19 at 07:29
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    @towe Nice spot in the FW of PyCNC! For reference in Marlin default config.: `#define DEFAULT_MAX_ACCELERATION { 3000, 3000, 100, 10000 }` for X, Y, Z and E respectively. – 0scar Sep 19 '19 at 08:04
  • Thank you both. I have managed to make the Z motor work by adjusting the `STEPPER_PULSES_PER_MM_Z` to 50. I'm not sure what this exactly is. ‍♂️ – haxpanel Sep 19 '19 at 15:02

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