I have a CR10SE that was printing fine. I switched to printing with PETG and all was fine and then switched back to PLA. Before printing the PETG I moved the printer from the floor to on top of a low cupboard. The printer is in an enclosure.
Since switching back the printer seems to knock the print off the bed when it gets about 3cm high. I have been printing a temperature tower as a test to see if the problem is reproducible and it seems to be. I do a calibration before each print. I have checked the bed levelling with a spirit level and it appears to be horizontal.
Looking on line people suggest that the cause could be that the z-offset is incorrect and eventually the error causes the nozzle to hit the print. But I can’t control this and I do a calibration each time. Others have suggested that some part of the printer might be loose but I there are a lot of places to check and i have not found a loose screw/bolt so far.
Any suggestions of how to troubleshoot this problem? I have enjoyed many successful prints in the 6 months I have owned this printer and its frustrating that it does not want to print successfully at the moment.
