Tightening Tool for Modular Ball Bearing Spool Holder
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An add-on for the modular ball-bearing spool holder which makes installing & removing spools much easier.
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- Printables
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- Prusa Parts & Upgrades
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- Creative Commons — Attribution — Share Alike
I like hachleitner's modular spool holder design since it solved my TPU filament feed issues, but tightening/loosening the hub nut was problematic for me. I found it difficult to reach behind the body of any given spool I'd be installing/removing to hold the hub in place so I can turn the the hub nut. My need to fix the hub in place might be because I used a rough filament (PA-CF) for the spool holder, but I didn't feel like reprinting in another material (not that I have many heat-tolerant ones on hand).
Anyway, this "tool" press-fits over the original hub's three tabs at its base. You then reinstall the hub as per the original's directions. The tolerances yield slightly tighter than what you might call a machinist's fit. I used an arbor press to install the tool onto the hub w/o the need for adhesives. You may want to file back the hub cutout for a loose-enough fit that adhesives can finish the job without need to use a press.
The gear form I chose now gives me easy access to hold the hub in place. I sized it to match the spools I have; you might need to lengthen the gear teeth (but not scale the whole model) to meet your needs. It isn't exactly pretty, but it got the job done & kept me printing w/o having to find or design a different bearing-based spool holder.