Compact filament transport system for MMU2

(update 20.0526: "printerstöd" is back - it was unintentionally removed, sorry. Also the "mmuPTFE" was added to support 5mm/3mm (outer/inner diam) PTFE stubs. On ebay, I bought 2 metres at low cost.)
(update 20.0523: I re-designed the entire buffer ages ago, however forgot to upload it. Here it is. See the two .3mf for how to print it, or print the STLs in the way you prefer.

• much easier to print than before (if needed, sand away a few printed micro-supports after print)
• much easier to load - filament can be guided through the opening along the entire buffert side
• easier mmu-load-opening. Please note, I intentionally have this opening to give flexibility to re-organize filaments without re-loading the buffer, and skip over the buffer when not needed. It's just more convenient on an everyday basis.

enjoy
)

(update 190224: "filament PTFE connector" and "filament cover": improved design)

If you have an i3mk3 with mmu2, and lacks space, this compact setup might be for you. The filament cage (which was designed way before prusas release of mmu2s btw) sits on the back of the printer, just at the level needed to print full size objects. The cage has been proven to work with all filaments, including ColorFABBs brass fill (see comment, though). Moreover, the cage can be released during filament insertion to ease your back. An added insertion tool makes the insertion quick and easy. For flex material, an additional cover ensures the path will be followed.

The filament rolls are set up in a compact way, re-using Prusas original ball bearings and metal rod, without using more space than necessary.

You will need about a meter or so of 3mm PTFE tube. The reasons for using 3mm tubes are several:

• Much more convinient to be able to drag the tips through the tubes
• Less tube length means less load time
• ColorFABB brassfill cannot be printed using 1.75mm if you are not equipped with very much luck.

However, if you WOULD like some other tube dimension then just edit column B in the freecad document spreadsheet and voila!

Note: brassfill of all materials might break very easily - at best, short cut the brassfill path directly from the filament PTFE connector and have a straight path (no bends, nothing) to the spool. Set the MMU2 and the idler to as low pressure possible - every minor grind might later cause a break. And, do not forget to set all load speeds under filament->advanced in slic3r to 3mm/s, 20s and so on, VERY slow it should be)