Temporarily not available due to price changes at Shapeways.
It arrived in WSF, and it works for real :-) Gear system based on hypotrochoid shapes. It is printed as a 9 piece puzzle, a VERY frustrating one at that ;-)
Depending on the print batch, it might need some minor sanding to make it run properly.
Steel available on request, still untested by me. I think steel will work but probably needs some more sanding to make it fit.
With the new pricing scheme, the steel version is no longer available.
If you want one in steel, please send me a message and we will find a way.