m3_bolt+nut_16.5mm

updated on mar.29:

V3:
added a little tolerance, download this one.

v2(shiny bojo) with nut

older version: http://www.thingiverse.com/thing:191391

Edit it online https://tinkercad.com/things/5dWygdFdB5E

Tell me how it comes out plz if you have tested it.
And the setting you use.