Strange bed mesh wall on delta printer (Flsun QQS Pro, Klipper)

General Discussion
1

Hi,

I’m having a very strange bed mesh result on my delta printer and I can’t figure out why.

Printer: Flsun QQS Pro
Firmware: Klipper

This is the mesh result I get (see screenshot). One side of the mesh suddenly shoots up like a wall. The strange part is that the probe never goes outside the bed and nothing physically changed.

Sometimes the mesh looks somewhat normal, but other times I get this huge spike.

My bed_mesh config:

speed: 80
horizontal_move_z: 5
mesh_radius: 90
mesh_origin: 0,0
round_probe_count: 9
algorithm: bicubic
fade_start: 1
fade_end: 10

Things I already checked:

  • Probe mount is tight
  • Bed is not loose
  • Probe repeatability seems normal
  • Probe is not going off the bed

Does anyone know what could cause a mesh like this on a delta printer?

Unknown
Unknown3373×1844 299 KB

Thanks!

2
  • Check belt tension
  • Check if umbilical is getting snagged/stretched/pulled
  • Check if probe electrical connector clear of rods.
3

Please attach the requested klippy.log to your next post.

4

Also I would try reducing your mesh_radius to 80 or 85 to see if that fixes the issue.

5

Thank you for your answer, then it will indeed be a little lower, but it only disappears at 60

6

You’re right

klippy.log (6.9 MB)

7

I’ve done all of that, but that changes nothing.

8

315 looks pretty long for arm_lenghts. My qqsp are more like 280 for arms and 140 for delta_radius.