[BUG] G30 - unwanted bed movements

[mafr95]

Did you test the latest bugfix-2.1.x code?

Yes, and the problem still exists.

Bug Description

Each time the G30 command is executed, the probe moves to the XY coordinates of the nozzle before probing and return after. I understand the idea that the Z probe should start exactly at the xy-position of the nozzle. However, this behavior causes my bed to constantly move between measurements with L-Corner or the octoprint plugin AutoBim, which makes it impossible to adjust the bed screws.

https://www.youtube.com/watch?v=Bxp1_7POnQ4

The probe did not move in the earlier Marlin-2.1.2.4 release.

Bug Timeline

No response

Expected behavior

No movement expected before and after probing.

Actual behavior

No response

Steps to Reproduce

No response

Version of Marlin Firmware

Marlin bugfix-2.1.x

Printer model

Sidewinder X1

Electronics

No response

LCD/Controller

No response

Other add-ons

No response

Bed Leveling

UBL Bilinear mesh

Your Slicer

None

Host Software

None

Don't forget to include

• A ZIP file containing your Configuration.h and Configuration_adv.h.

Additional information & file uploads

Configs.zip

[ellensp]

To adjust screws you use ASSISTED_TRAMMING G35

G30 tells you on serial console X,Y and Z position eg "Bed X:20.00 Y:20.00 Z:0.000"

[ellensp]

22 months ago a commit entitled "Fix G30 behavior" added a move after probing to move the hotend to the probe point

This looks to be deliberate and intentional.

25e5a35

"do_blocking_move_to(old_pos);"

[mafr95]

To adjust screws you use ASSISTED_TRAMMING G35

G35 works fine, but plugins in octoprint like AutoBim use other commands including G30. The L-Corner option in my BTT TFT 35 also seems to use G30.

Therefore, it would be helpful to have an option in Marlin to disable the

“do_blocking_move_to(old_pos);”