1/4" Carriage Bolt Knob
thingiverse
Just another carriage bolt knob, this one is for a quarter inch diameter rod. If you need one for three eighths of an inch, check out the version I created on Thingiverse at https://www.thingiverse.com/thing:2759151 There are two versions available, v1 is a shorter knob that requires no supports, while v2 is a more traditional design that needs support material to print correctly. UPDATE - I've recently learned how to add knurling in Fusion360 and decided to practice on version 1. The result turned out well enough for me to upload it as version 1.2.
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