This is an experiment to build a Linear Delta Printer using four towers instead of three. Primary reasons: 1. Build area is roughly cubic vs roughly cylindrical 2. Greater speed and precision from additional control provided by fourth tower. 3. Symmetric kinematics from even number of towers.

This build is to show what's possible as well with openBuilds! I use a single ArduinoMega and 5 separate stepper drivers (A4988). The LEDs are all NeoPixels. Collision 'detection' is all done within the code, so the endstops are only sensors I use in this build. I'm a self-employed video-artist and this is my first installation which just needs power and it runs (where I'm quite proud of). Normally my interactive installations take a long setup time, so this installation is a relief :)

The QuadRap 3D printer version based on OpenBuilds wheels. Born in https://plus.google.com/u/0/communities/103539262895202172380