Allows electrical contact through a rotating 10mm diameter shaft.

I recommend printing the thing in resin, for optimal results. Although, traditional FDM printing can probably do the job as well (didn't try). Any resin will do as long as it doesn't conduct electricity. I used Sunlu's Standard resin. The copper traces you see on the pictures are made via 5mm copper tape. The wires are then soldered onto the traces (see pictures). In order to work properly, the bottom face of the comb (Part4) needs to be positionned 29 to 30mm beneath the axis of rotation of the tube. The entire assembly is 33mm long and fixed to the shaft using a 5mm long M3 grub screw. The parts are put together using superglue.

Each parts needs to be printed once, except for Part2 (x4).

If you have any question, please ask.