Prusa MMU2.2

thingiverse

I corrected version of MMU2 with working cut-off of filament. I tested the cut off at PLA, ABS, PETG, Carbon PETG, ESD PLA, HIPS, and FLEX (made a bit of noise). Using a cutter is good if you use your printer often because the PTFE tube inside the extruder gets brushed and the ball at the end is too big to pass through the nozzle afterwards. The main redesign was done on the part with M2 or M2.1 screws. I used the model mmu2-front-PTFE-holder(M2)-screw-blinder-4x to block holes in the model mmu2-front-PTFE-holder(M2). Occasionally, a shred gets stuck in the screw hole. Also, the model mmu2-front-PTFE-holder(M2) prints from the smaller side on the bed - front side. In the models are two pulley-body(M2)s. I fixed the design to match Prusa's by making holes for shreds. The removable Bowden has the capability to easily remove Bowdens from the spool side, for example cleaning, changing PTFE tubes, or maintenance on the printer. For the removable version, you need five extra 19mm PTFE tubes, five M5 nuts, and a press connection for tube dia 4mm with an M5 thread, for example type 153304_QSM-M5-4. To release the cutter in firmware, refer to Prusa's github and just uncomment line //#define MMU_HAS_CUTTER in Prusa-Firmware/Firmware/variants/your_printer_variant.h