STRAP
thingiverse
Use an M4x12 or 14mm hex bolt. Slide M4 nut into slot. **THIS IS UNTESTED**
Download Model from thingiverse
With this file you will be able to print STRAP with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on STRAP.