Hi Marco,

one thing also about smoothness. 3D printers (may) produce also stairs on the surface of
the model unless you use a 3D printing technique like for example PolyJet 3D printing
which is very expensive, but imho molds can be made of the models.

Here are three photos. The Batwing cube i have printed in 2009 at Shapeways, smooth
surface but also stairs due to the printers resolution.



The color print of the fractals is a high res print but show also stairs due to the printers
resolution.



And finally Nefertiti printed on a PolyJet printer, bad photo but super high quality print
with fine details and a super smooth surface without stairs.



Regards
Stefan