(TPU) Filament stops feeding mid-print
I have had this issue many times now, on two different kinds of filament as well.
At some point the filament stops feeding. Manual Purge yields no result. Unloading the filament works halfway through, but requires some force to pull out in the end.
The filament shows indentation roughly coming from the block where it feeds into and gets transported by the gears to the PTFE tube leading to the hotend.
I have a hard time figuring out the cause. I tried loosening and tightening of the spring screw adjusting the tension of the filament. It will work after loading the filament again, but not for very long.
Any ideas?
RE: (TPU) Filament stops feeding mid-print
I have had this issue many times now, on two different kinds of filament as well.
At some point the filament stops feeding. Manual Purge yields no result. Unloading the filament works halfway through, but requires some force to pull out in the end.
The filament shows indentation roughly coming from the block where it feeds into and gets transported by the gears to the PTFE tube leading to the hotend.
I have a hard time figuring out the cause. I tried loosening and tightening of the spring screw adjusting the tension of the filament. It will work after loading the filament again, but not for very long.
Any ideas?
The nozzle could be partially clogged, causing to much resistance. TPU is especially sensitive to it as it is so soft. Try cold pulls, with something other than TPU. If that does not work, and it still is clogged, replace the hot end PTFE tube. If during the cold pull you feel how much pressure it takes to push filament through by hand, you can tell if it is clogged. But you need to have done it with no clog to have something to compare it to.
https://help.prusa3d.com/article/cold-pull-mini_126399
https://help.prusa3d.com/article/clogged-nozzle-hotend-mini-mini_112011
https://help.prusa3d.com/guide/how-to-replace-a-hotend-ptfe-tube-mini-mini_119449
Regards,
Mark