Vitamin Free-ish 73mm Spool Roller
by Physics_Dude, published
I never found a spool roller for the seemingly quite common 73mm wide (68mm at center of walls) spools that companies like ProtoParadigm and MakerBot sell, so I decided to make my own.
This spool roller allows standard 608ZZ roller bearings to be snapped in and stay secured without any additional hardware.
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Depending on your printer, you may need to sand or file down the ridges that hold the bearings in place to avoid breaking the vertical risers.