I have had my Ender 3 Pro for about 2 years now and it has been working amazingly!
Since November it's struggling very much while printing. I am quite sure the problem lives on the extruder motor.
About 1 of 5 prints come out ok. The main problem is that the first 2-3 first layers are all good. But as the prints develop, under-extrusion problems come. It's not a clog, because I can push the filament and it flows smoothly. It's like the motor cannot push the filament to the feeding line.
Thing's I tried so far:
- Upgrading the extruder from plastic to aluminum (verified the tension, not too loose, not too tight)
- Changed hotend (PTFE, nozzle, block, etc)
- E-steps calibrated
- Tried switching MicroSD
- 3 different brands of filament
I noticed that the motor is getting pretty hot. I mean, you can't have your hand in there for more than a second. My theory is that this overheating softens the filament and it cannot feed. Is this possible? The aluminum extruder also gets pretty hot. There is no clicking sound or anything weird while printing, the first layers come out perfectly ok.