Prusa MK3 Filament Guide for External Spool Holder

thingiverse

I'm not keen on the idea of a 1kg filament spool mounted on top of the frame, which isn't rigid enough to justify strapping extra weight to it. I couldn't find any designs that met my needs, so I decided to create one myself. Perhaps it's a bit too complicated and bulky (adds over 20 cm to the printer height), but it gets the job done. The STL files are more than a year old, and there might be some small errors (like the front pulley holder cover, which doesn't fit properly). Or the front pulley itself... it's rather ugly. But nothing serious prevents proper function. This design is compatible with the Original Prusa i3 MK3. It may also work for the MK2 or any other printer using the same frame type. You could easily design different mounting parts yourself to use this on various printers. To print: 1x main_pillar 1x pillar_mount_1 1x pillar_mount_2 1x front_pulley_holder 1x back_pulley_holder 1x back_pulley_holder_cover (optional) 1x filter 1x pulley_front 2x pulley_back 6x bearing_center Other non-printed parts: 3x 608ZZ bearing 3x M4x20 bolt + nuts 2x M4x16 bolt + nuts 7x M3 bolts + nuts 2x M5x18 (or slightly shorter) + nuts piece of fabric to fit into the filter box small piece of PTFE tape or something similar