Bed mesh rear level low

General Discussion
1

Basic Information:

Printer Model: Voron 2.4
MCU / Printerboard: Octopus Pro V1.0.1
Host / SBC : RPi 4 / Mainsail
klippy.log
klippy.log.txt.zip (1.2 MB)
Mellow Eddy coil sensor

Describe your issue:

Low_Rear
Low_Rear921×2048 72.3 KB

Hi All,

I’m turning crazy, whatever I do, I can’t get the rear of the bed, leveled to the front.
And strange but, the rear of my prints are over squished like an “over-compensation”…

I used tape to increase the rear height of the bed with no luck.
In fact, the QGL should set the four measured points at the same level ?
Then the Bed Mesh should average all around ?

Anyone have an idea why the rear of my bed is ALWAYS lower (~0.3mm) that the front ?

Thanks for your help !!!

2

printer.cfg (11.8 KB)
macros.cfg (7.6 KB)

If needed, this is my config files.
Thanks for your help.

3

And the last one.
SB2040V3.cfg (4.9 KB)

This is the shape of my Bed before I applied tape :

Low_Rear_Before_tape
Low_Rear_Before_tape921×2048 97.7 KB

I don’t understand why QGL/Bed Mesh keep rear as low…

All my big prints are too squished at the rear of the bed and too light at front.
Like an “over-compensation”.
All I do is at the same temperature, 50°c for the bed and 220°c for the nozzel.
The Z end_stop is calibrated at the center of the bed, the Eddy coil too.

Thanks

5

IMG_20241027_004700
IMG_20241027_0047001920×1636 215 KB

Even if I increase the tape layers number, the rear is always ~0.3mm lower than front.

6

Update to latest Klipper Git version and check if this improves your situation. For background information, see [BUG] Accumulating microstep shift during probe moves related to endstop oversampling.