nRF51 holder

You can modify the drawing if you have a free account on Onshape.com. The link is https://cad.onshape.com/documents/3f05e14ebb62415c928ff36e/w/d85b78be98c545f6ab2fd41f/e/7053fbf40382442182af2f67

The screws are M3. If you don’t have a tap to cut the threads, you can use a screw. PLA is soft enough for that.

The gcode works on my Reprap µDelta.