Summary

Same as the original Kossel Mini 800 effector, but modified to fit the E3D V6 hot end.

The Diameter of the fixing hole was increased to 16.2mm (giving it 0.2mm tolerance), and the depth was decreased to 3.8mm (with no tolerance, to ensure a tight fit when clamping).

Recommend using a hard plastic like ABS, but also one that doesn't warp. My test print was done in solid Nylon 645 and flexes slightly.

Relevant parts you may also need:

6 x N52 Strong Round Magnets (∅12 x 4mm)
6 x ∅10 M4 Threaded Ball Rod Ends
6 x M4x20mm Grub Set Screw
6 x ∅6x4mm L200mm Carbon Fiber Tube Rods

You can find the majority of these items on this ebay store page:
http://stores.ebay.com/hksupport/Rostock-Kossel-Delta-/_i.html?_fsub=6333435016