TUSH rack with threaded rod
thingiverse
I modified TUSH to allow the creation of a rack of spools that are affixed. The Ultimate Spool Holder (https://www.thingiverse.com/thing:2047554) worked great for me, but they kept sliding around. I took the bearing mounts and replaced it with two 5/32" threaded rods, but I think M8 threaded rod will also work, if you have it. I also made a double-mount section to properly space the spools. To start, print one "Middle" piece and six "end" pieces. This will give you enough to hold 2 spools. You'll need 2 threaded rods and 12 washers and nuts, as well as eight skateboard bearings (I bought mine on Amazon https://smile.amazon.com/gp/product/B01M62EBAX) to start. Add one "Middle" piece, two "End" pieces, and four more bearings for each additional roll.
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