Z_TILT_ADJUST z feedrate exceeds max_z_velocity

General Discussion
1

Basic Information:

Printer Model: Twotrees Sapphire plus v1.1
MCU / Printerboard: MKS robin nano 1.2 / rpi 3b+
klippy.log
klippy.log (248.6 KB)

Describe your issue:

The start of the Z_TILT_ADJUST movement moves the bed by the specified amount in the config file just fine, but it seems to do it at a higher feedrate than the max_z_velocity established in my config.

I can only replicate the noise and speed of the first z move that Z_TILT_ADJUST performs by setting the max speed of the z to 250mm/s

I don’t know how to get that limited so that it’s not shaking my printer like crazy but I couldn’t open an issue.

Maybe being able to set that speed would be fine? The movement speed of the adjustments is fine so I don’t really understand what’s going on

2

Hello @Pastitas !

Sure it is faster:

speed = 80

in

[screws_tilt_adjust]
3

Okay, yeah, my fault :rofl: Totally missed it, Thanks @EddyMI3D !

1 Like
4

@EddyMI3D Actually lowering the number in that section didn’t seem to have an effect on the first move of the z tilt macro, only for the measurements.

5

I had another look on the klippy.log.

There a lots of macros that modify the speeds, at least two of them the travel Z speed:

  • [gcode_macro _park_inner]
  • [gcode_macro resume]

There are a lot of dependencies with those macros.

Honestly: I keep my printer.cfg as slick as possible. Only those macros I need to make it work properly. The more you have, the more it can get unmanageable.

6

Okay, finally found some time to work on this, the issue still stands and is the same, I’ve removed all macros except for the ones from mainsail and still there’s a Z movement faster than 15mm/s (the max z speed set on the config) when lowering the bed for the first time for what seems is the clearance for the Z_TILT_ADJUST.

Updated klippy.log (89.3 KB)

Sumarizing:

  1. Call Z_TILT_ADJUST;
  2. Rapid (faster than 15mm/s) z movement lowers the bed;
  3. The first probing happens;
  4. The bed lowers at a normal (15mm/s or less) speed;
  5. Continues z tilt adjust with expected speeds and behaviour.