I would like to print railroad models using raw brass. In opposite of jewelry, I have very limited options where to put the intakes for bras poured into mold.
(I don't want to lost fine details on visible surface)
I want to design the model with intakes at specified places. The question is, how to instruct the shapeways staff to use intakes defined by me and not a random one.
(A used a competitive service and they put the intake in the middle of visible side destroying the details :-) )