Derek Bosch wrote:
how thin are those rings? On shapeways they say the min-thickness should be 3mm, but that looks quite a bit thinner...
The band varies from 0.60 mm at the edges to 1.4 mm at the middle.
I suspect Shapeways listed the wrong dimensions for the stainless steel. The manufacturing process is very similar to SLS polyamide, but with the added steps of infiltration with bronze (to make it solid) followed by polishing (to make it smooth).
How well does that ring work in metal? I have it in nylon, and it sort of works, but the material is weak enough that it's very easy to cheat.
The stainless steel ring is much more rigid than the polyamid ring so it's less vulnerable to 'cheating.' But stainless steel is manufactured in multiple steps, described above, yielding unpredictable tolerances that make the ring tighter in some places and looser in others.
A drawback of metal is that it's non-elastic. Someone did
try to cheat on my stainless ring, slightly deforming one of the pieces. But I think they must have applied an unwise amount of force, since the pieces certainly don't bend easily.