Spool holder with 3030 and 2020 extrusion mounts

thingiverse

A spool holder designed for ease of use with both small and large spools, provided they have decent walls. Primarily engineered for my Zaribo-modded Prusa i3 MK3S, but I adapted the design for 2020 extrusions as well (for my Alfawise U20), and created a tabletop version at a friend's request. You'll need four 608 bearings in addition. The holes are sized for an M6 screw on the 3030 version and for an M5 screw on the 2020 version. Compared to regular spool holders (where you simply hang the spool using the middle hole), it's easier for the extruder to pull the filament, yet the rolling resistance is still substantial enough that it won't pull more than necessary. Unlike spool holders with bearings that clamp the spool in the middle, this design minimizes constant adjustments when switching between wider or narrower spools. Thanks to rollers, you don't need to adjust the spacing between the sides constantly when transitioning from a smaller to a larger spool. **Smallest spool tested:** 330g PETG spool which came with the Prusa i3 MK3 to MK3S upgrade kits **Largest spool tested:** 2kg Filament PM or Devil Design PLA spools (may tip over on the tabletop version) **Other spools tested:** 1kg Devil Design, Prusament spools (as long as you don't drop them), 750g Fillamentum, 1kg C-tech (a bit wobbly due to thin walls, but it works), 1kg Creality (appears to come in different spool sizes, some of which are a bit wobbly, but they function properly) **Tip:** if you wish to use wider spools, simply scale the rollers to the required length.