Bed levelling causes this damage to the PEI sheet
Before printing, the printer nozzle pecks at the PEI spring steel sheet a dozen times. Each place is now damaged. It seems the hot nozzle is damaging the PEI in those specific places. Each mark is a donut the dimensions of the nozzle tip. In the photo, the white material in the row of marks is the PEI coming off.
I understood that a load cell was supposed to stop the vertical motion when the nozzle touches the bed. But then why this?
Prusa support wants me to check the nozzle position, the firmware and the spool position. I don't see how any of these could cause this damage, particularly if the load cell is working.
Any ideas?
RE: Bed levelling causes this damage to the PEI sheet
The same thing happened to me last week. I had to remove the nozzle and reattach it and it started working properly again. But the PEI is damaged. 😥
Sorry for my poor English. I try to do my best.
RE: Bed levelling causes this damage to the PEI sheet
I can see that happening if the nozzle is loose as it will continue pressing until the slack is taken up but cannot see how the firmware or spool position would make a difference. My gut reaction though, is a faulty/mis-calibrated load cell.