After addition of the MMU3 to my MK4, I can no longer even load TPU (not through MMU3). Extruder Change issue?
Ive printed TPU (literally the one roll I have) a number of times, and really quite enjoyed the stuff. But a month after my MMU3 upgrade, I went to print some today and am stumped.
I turned off the MMU3, and ran the TPU in the reverse Bowden PTFE tube, just like I did before I had the MMU3. I cant even get it to the point of purging, it starts wrapping around the gear. I end up having to unload it, and pull it out, revealing about 3 inches of TPU that comes from...somewhere inside.
With the changes to the extruder, is there something I need to do differently now?
Appreciate any insight someone can shed on it.
RISPONDI: After addition of the MMU3 to my MK4, I can no longer even load TPU (not through MMU3). Extruder Change issue?
hello I also have trouble printing TPU.that's why I DON'T USE MMU3.
I saw that with less tension on the 2 screws before the extruder, things improve
RE: After addition of the MMU3 to my MK4, I can no longer even load TPU (not through MMU3). Extruder Change issue?
I turned off the mmu3, changed to a .6mm nozzle and loaded the filament directly to the extruder and it worked. It did the same thing you described when I tried it with the .4mm nozzle. I didn't change the tension on the 2 screws. I have know idea if it will work next time or not but worked for a couple of prints anyway.
RE: After addition of the MMU3 to my MK4, I can no longer even load TPU (not through MMU3). Extruder Change issue?
I found an issue with TPU after I changed to the new filament sensor design (coupling with the idler movement). Due to the softnes of TPU the movement of the idler was not long enough. I changed back to the original sensor (with the steel ball) and it worked again.
Another issue with the TPU is the tension caused by the TPU. TPU get's streched an the extrusion is no longer sufficient. I overcome this issue by manually feeding some meter of TPU on the input of the MK4 (after the buffer if you use one).
TPU will never be a "click and forget". But with a little care you can even print PLA / TPU mixtures.