OpenStructures joint for microphone stand

This is a set of 3 disks that can be screwed together (using 5m bolts) to form a joint for a microphone stand.

I've made one with a 30 degree angle, but that's easily changed in the code.

The position of the holes is based on the OS Grid. (http://openstructures.net/pages/9#deel2a)

The Scad file has all three parts in it, aligned the way they fit together when assembled. I printed the disks one by one, so there's 3 different .STL and .X3G files. (I'd like to know if there's a standard w