Prusa i3 Mk2s MMU Modified Extruder For Bowden Style Input

thingiverse

I didn't like the feed input to the extruder, and if you have the spools above the printer, the filament can rub against the extruder, making a squeaking noise that was very annoying. But this is also part of a frame support for four filament rolls, and I was using the 4mm outer diameter PTFE tube. However, I felt that some people might want just the extruder to fit in with their setup. Parts List: 2 modified Extruders 4 M5 x 7mm Brass inserts 4 Festo QSM-M5-4 Push-in Fittings 4mm OD 2mm ID PTFE Tube (Cut to Length) I used M5 x 7mm brass inserts that I found on eBay, which were available for not a lot of money. I tried to match what Prusa used, but they worked out very expensive in comparison. I used Festo QSM-M5-4 Push Fittings that I purchased from RS Online. These are the same as the ones Prusa included with the MMU. https://uk.rs-online.com/web/p/pneumatic-straight-threaded-to-tube-adaptors/1216037/ I reused the brass insert from the Prusa extruder. I screwed in a Push fitting (a screw or bolt will do; I just didn't have any M5 fixings here) and with a bit of force and a pair of pliers, you can wiggle and pull the existing brass inserts out. Also, take the short PTFE tube as well. All brass fittings are press-fit, or if you want, you can heat up the plastic before pushing it in. I used a vice. Don't forget to fit the short PTFE tube. I made the hole 7.1mm; this is due to material expanding and making the hole smaller. 4 Roll frame holder https://www.thingiverse.com/thing:2822310 When cutting PTFE, do not use side cutters; it crushes the tube before cutting and makes it oval, which makes it harder for the filament to push through. Use a sharp craft knife and it stays round.