Woodstock Delta Printer

I have been building derivative Rostock Delta printers based upon Johann's excellent design for several years. My current version, which uses magnetic ball joint arms, is derived from the original Johann Rostock, as well as several other designs posted here on Thingiverse.

Here's a Youtube video of it in action:
https://youtu.be/jT24ClLlQKo

This design uses a direct drive extruder, the Titan by E3D. When they released this product, I realized that this geared extruder with a pancake stepper motor was just what I needed to chuck the bowden extruder in the bin and mount it directly on the end effector.
The whole effector with the extruder drive and E3D hotend weighs under 300grams.

Since I have modified many of these parts, I thought it would be helpful to gather up the pieces in one place to assist others in making their own Woodstock Delta Printer!

While the base stucture is exactly like the original Johann Rostock, with 8mm smooth rods placed in pairs 60mm apart, and u