m5x16mm cap bolt tested
thingiverse
Printed at 0.12 and it fits snugly onto an M5 nut with ease, maybe slightly loose. It uses the standard 4mm hex key, which is perfect for tightening. If you want a tighter fit, try using an outside thread diameter of 4.9 or 5mm for a rock-solid hold. See below for modification instructions to customize your bolt. Customized version of https://www.thingiverse.com/thing:193647 Created with Customizer! https://www.thingiverse.com/apps/customizer/run?thing_id=193647 The photo, once loaded, showcases the test I ran - and it just so happened that translucent red material was used. A brim was applied, resulting in a messy printout, but it's not necessary for this small size.
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