I have been using my UM1 for nearly a year, and it has been working pretty well. Recently, I am seeing a lot of extrusion problems, and I'd appreciate any advice.
Small prints work fine. Larger prints work fine for about 20-30 minutes, and then the rate of material flow slows down significantly, the bowden tube pops out of the top of the extrusion head, and the filament flow stops. I fix the bowden tube, and the next print works fine for the first 20-30 minutes, then the problem presents itself again.
I have completely replaced the hot end, the bowden tube, and the material feed mechanism, but the problem still persists.
Any ideas or suggestions?