Mighty RepRap Power Ring
This is a 20mm internal diameter signet ring, with the RepRap "teardrop" logo in the face. It looks good printed from PLA and sprayed with nearly-gold paint.
None - the ring is just one piece.
File:Reprap ring.stl - STL File for 20mm signet ring
File:Reprap ring.aoi - AoI Source file for 20mm signet ring