Source on Github : https://github.com/hugokernel/OpenSCAD_Things/tree/master/Bowden%20Clamp%20v34 12mm washer is required to distribute the clamping force from the bolts.4 slots are provided below to place the nuts to hold the 2 electronic board. Instructions :- Get pneumatic push-fit like this one http://www.ebay.com/itm/LOT5-One-Touch-Hex-Socket-Male-Connector-6mm-1-8-thread-Replace-SMC-KQ2S06-0... (you need to drill the bottom part)- Print support.stlMore information in french here : http://bit.ly/1aY8ZWj