Original Prusa i3 MK3 MMU2 Back Catcher

thingiverse

UPDATE: Take two on this issue https://www.thingiverse.com/thing:3128344 UPDATE: After receiving my MMU2, I've been working on resolving this issue and have found that the approach in this size is not acceptable due to a massive backfeed of 500mm, requiring an enormous chamber. I'm currently testing a new approach which I'll post here soon. Rob In preparation for my upcoming MMU2 (ordered since Oct17), I've imagined a solution for an extremely relevant problem many people will face with the MMU2. Each time a filament is parked, it's retracted to the MMU2 unit, pushing about 300mm of filament backward. If using provided spool holders, this isn't a big deal as spare coils on the table remain until fed back in again. I'll be using SpannerHands Spool holders with PTFE tubing throughout the feed path, meaning any pushed-back filament will attempt to push back onto the spool, likely causing it to come off and jam soon after. This design, yet to be tested, catches retracted amounts of filament for four parked feeds until needed again. The size of the chamber may still need increasing to prevent tangles and jams within. Testing will reveal this. If you have questions or ideas, please leave a comment; I'm always open.