Hello!

My problem seems very similar to a recent thread about the 5th gen, but I have a 4th gen and different parts so the solution does not apply.

My 4th gen came with the upgraded extruder (not the smart extruder) and over 300 hours on it. The software and firmware are up to date. The nozzle is clean and everything is greased up. I am using makerbot PLA filament.

It prints rafts like a champ, but very often the extruder will gradually get closer and closer to the build plate during the course of a single print until it becomes clogged up. Large prints are only successful if I repeatedly adjust the screws underneath during a print.

Does anybody have any recommendations?

Thank you!
-Matthew