Parametric Bit Driver (hex 2mm to 10mm)

by Crono Jan 22, 2018
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Thanks Crono! your design inspired me to make my own Hand drill for drill bit with hex shank:

Hand drill for drill bit with hex shank
by Kardis
Comments deleted.

I printed the 4mm version in PETG. Seems to be a little bit tight, but works great. Now I'm curious to look into the SCAD source and find out why. Thanks for posting it!

I have included a 0.2mm additional tolerance and its still too tight? I admit that i have not tested the updated (parametric) version of this driver.

In the OpenSCAD file there is one line which might help you tweaking this one for your printer:

hex_diameter = bit_size * 1.154701 + 0.2;

0.2 is the size in mm that is added to the regular hex-bit-size to ensure it works well on 3D printers.