I’ve been doing quite a bit of printing with a Z18 for the past couple of months - the machine is owned by my employer. Last month I invested in a Smart Extruder + and swapped it for the original Smart Extruder. Yesterday I began having issues with the extruder becoming detached repeatedly - I was running the filament from the drawer. I swapped the filament out for a new roll and ran it from the exterior instead and began a new, big print. I came in today to the same problem: the extruder was detached again and my print had failed. When I reattached the extruder and tried to pick up where I had left off, the carriage/extruder began acting REALLY strange.
First I noticed a grinding and clicking sound as the print re-started. When I took the lid off I saw that the carriage was grinding against the sides of the machine and hitting the back as well. It was spewing filament OFF of the back of the build plate. I cancelled the print and it “homed” just right of the wire brush. I calibrated the Z axis offset and tried again: same issue. I reset to factory defaults: same issue. The carriage even banged up against the sides of the machine. I then noticed that the front left pulley was making terrible noises as the belt fed. I also noticed that the pulley looked a little wobbly as it turned. I took the door and face off of the machine and tightened the pulley back down. I then started a new print…SAME PROBLEM. It started in the correct home position but still had issues.
I then decided to swap the Smart Extruder + out for the old extruder and ran a test print. It printed just fine. So I decided to retry my big print: it managed to print the raft and then stopped, saying that the extruder had DETACHED again. Can someone offer some advice? I’m at a total loss here and have this huge project deadline. Any help is much appreciated.