During a recent print, I noticed some buildup on the nozzle. I pressed the pause button on the screen, cleaned off the nozzle, and pressed resume. When the head moved back to printing, it had shifted about 2mm to the left (as shown in the image below). Never had this happen before.
Since this started, I have adjusted the tension of the XY belts, replaced my Z belt, and checked for any random machine g-code changes (slicer had default pause code). I can’t get rid of the layer shifting.
All the topics I’ve read about in the forums seem related to pause for filament change. However, this is only when I use the pause on-screen. Any ideas?
machine g-code for pause
;M400 U1
M400 U1 ; Pause for user intervention
G1 X60 Y265 F15000 ; nozzle wipe position
G92 E0 ; zero extruder
G1 E-0.5 F300 ; retract filament
G1 X100 F5000 ; wipe right
G1 X70 F15000 ; wipe left
G1 X100 F5000 ; wipe right
G1 X70 F15000 ; wipe left
G1 X100 F5000 ; wipe right
G1 X70 F15000 ; wipe left
G1 X100 F5000 ; wipe right
G1 X70 F15000 ; wipe left
G1 X60 F5000 ; clearance
IIRC the pause on screen has a homing sequence built into it? IE after a pause the head moves to the very front right corner before continuing on with the print?
Check to make sure your machine can fully home correctly. Often too short of PTFE tube (or 3rd party PTFE guide) will not allow the printer to fully home and so whenever a homing sequence is called the printer will show a layer shift because it can’t actually get to the home position but thinks it has.
To check the homing sequence power off the printer and slowly move the print head to the front right corner.
During a print on the X1C, when you press the on-screen pause button, the print head moves back to the poop chute location. When you press the resume button, it moves back to the print.
Hello same problem.
I define a pause on Bambu Studio to insert a magnet, the print head moves back to the poop chute location, but when I press “Play button”, the head had shifted about 10 mm to the left!
Same problem, with color change of filament.
Please help, thank’s.
A layer shift like this is often caused by either too short of a PTFE tube or by added “mods” which limit the head movement. Things like PTFE guides, stepper covers, purge chute covers etc.
Unplug the printer, take the top off and slowly move the head to all 4 corners to see when is causing the issue.
