GoPro on paintball barrel

This is designed for use on Tippmann FT-50 barrel

You need:
one printed piece.
one M3 bolt.
one M3x5x4 brass insert.

The inner diameter is 18.35mm for a 18mm tube. Once tightened fixation is very strong.

I use this mount for the video: https://youtu.be/Up__XNtx1Sg

(insert like this http://www.dx.com/es/p/jtron-m3-copper-flower-screw-nut-die-cast-screw-nut-mosaic-screw-nut-100-pcs-283956#.VS9_ySHtmko)

Actualization!!! The files are the same but rotated.