Printer Model: Klipper rebuild UM3+
MCU / Printerboard: BTT manta m8p + BTT EBB 42 CAN
Hi Guys
I have no idea why my printer is making these lines.
The hardware is okay, no Z-wobble. The printer is a klipper controlled UM3. Printed fine with the orig UM board.
I thought is could be uneven temperature, so i tried to PID calibrate hotend and bed, and it doesnt seem to make any difference. Anyway hotend temperature seems rock steady a +/- 0,5 degree.
Any suggestions?
Sorry - Here it is 
klippy.log (2.4 MB)
I think it is worth changing the bed heating method from control: watermark to
control: pid with the respective pid_Kp, pid_Ki, pid_Kd parameters ( see: Configuration reference - Klipper documentation) and then run the PID tuning for the bed.
If you check the klippy.log for the bed temps it is oscillating pretty much and this will cause deformations of the bed you can see in your prints.
I don’t know if its related but I was getting similar results just now when getting my new built printer working and it was because my bed is pretty balanced and the z stepper belts were not tight enough. They were pretty tight but needed to be tighter. On the small up and down movements it was varying and squishing the plastic.
Just a thought
