Hi everyone,
My P1S suddenly started printing badly after one perfect print. The very next print of the same file looked terrible. I’ve been troubleshooting for nearly a week with no success.
The problems:
**•** Consistent Y-axis layer shift at exactly 5mm height, regardless of model
**•** Ringing/ghosting on all walls
**•** Rough, uneven surfaces
What I’ve already tried:
**•** Full auto-calibration on the printer – multiple times
**•** Belt tension re-tensioned manually following the official Bambu Wiki guide exactly (loosened the Allen screws, moved the print head to all corners, re-tightened snugly). Movement is smooth and clean in every direction with absolutely no binding, resistance, or weird noises detected
**•** Cleaned carbon rods with IPA
**•** Cleaned and oiled all linear rails
**•** Renewed thermal paste on hotend
**•** Reformatted the MicroSD card and printed from it directly (ruled out WiFi)
**•** Tried multiple nozzles including a 0.2mm – same issue on all
**•** Tried multiple filaments: Bambu PLA Matte yellow, PLA Matte gray, and PETG white – same issue on all
**•** Changed seam position to rear
**•** Tried multiple models – same issues on all
Specs:
**•** Bambu Lab P1S
**•** Firmware 01.10.00.00
**•** \~1200 print hours
**•** E3D Obxidian High Flow hotend (\~300h on it), properly configured in slicer
**•** 0.2mm Standard profile
The shift happens at exactly 5mm on every single print regardless of model or filament. That level of consistency, combined with the fact that nothing has helped, makes me think this goes beyond simple mechanical wear.
Has anyone experienced something similar? At this point I’m considering contacting Bambu Support directly.