I had these printed through shapeways and my chinese printer for helmets, to compare options vs cost.
I'll let the pictures do the talking, i'm sure you can all see what i see.
The chinese body is polished ABS, very smooth and needs no clean up, just primer.
The Shapeways is Nylon and rougher, does need some primer putty and sanding to smooth out for primer.
Left chinese, right Shapeways


Chinese

Shapeways

Chinese closest

Chinese


Shapeways


Chinese right




Chinese

Shapeways
