Kossel Mini Cross Brace

This is a mount designed to hold cross bracing rod for a Kossel Mini delta printer (https://github.com/jcrocholl/kossel). The default parameters are for a 15mm x 15mm OpenBeam frame which uses M3 hardware and an M5 threaded rod, but could easily be changed to another frame size and mounting hardware.

The Kossel design is triangular and prone to vibration because the upper frame can twist compared to the base. These cross braces provide diagonal support along the upright rectangles, removing t