August 25, 2024
Description
Roller based minimalist spool holder. Super low friction using 608 bearings and very compact so you can fit 6 of them on top of a 350mm Voron 2.4.
The PTFE guide on the front is a print-in-plance swivel mechanism. Tolerances are very tight and you'll likely need to stick a screwdriver or bolt through the hole and force it a bit to break it free. If you absolutely can't break it free then you have some calibration to do on your printer - elephant foot is often the culprit in this type of design. You'll also want to swivel it around a bunch to wear the texture down a bit or if you want to be thorough sand the edges of the inner disc. Just be careful not to oversand it lest it no longer remain captive. PTFE should fit really tight in the hole in order to keep it in place. I recommend 2.5mm ID PTFE and for extra convenience, cut an inner chamfer into the end of the PTFE.
See exploded view for assembly hints. There's a 4mmx5mm M3 heat insert on the right side which is recessed (hole bored accordingly) for the 30mm M3 holding the swivel guide in place. The washer type things on the ends of the axle (labeled as “axle latch” should press fit to hold the assembly together. They don't have to be super tight because there's no force pushing against them really. But if they're not tight enough, just scale them down a bit in the slicer. There's no critical dimensional requirement to them other than the inner diameter to fit the axle. I've included printable axles and so far they've held up well in ABS printed horizontal so the sheer force is against the across the layer lines, not with them. However, you could use some 6mm smooth or threaded rods and print sleeves to snug the bearings onto them. I found that the tolerance is too tight trying to use 8mm rods with the 608 bearings.
Each spool takes
You could probably get away with printing a replacement for the 608 bearings with a tube with the following dimensions although they would add friction, of course:
Mount these onto 2020 profile extrusions spread apart just enough to keep the bottom of your spool from dragging on the surface below. I used 500mm extrusions to span the 510mm across the top of a 350mm Voron 2.4
I printed in Overture ABS with basic Voron parts printing settings:
Print in the provided orientation and the only support you'll need is simple supports on the Holder w/guide. My suggestion is organic supports on build plate only painted onto the one overhang. Optionally, paint some organic supports under the middle section of the swivel guide for stability if you find you're having adhesion issues when it gets toward the top.
2024-08-25: Per maker feedback, updated parts to use shallower profile alignment guide to account for differences in t-nut and profile depths.
License:
Creative Commons — Attribution — Noncommercial
7
Drakka01
