To get the most out of steindrucker you need to send him vector files in CDR-format (using his templates) ;)
I tried sculpteo recently. unfortunately the smoothing beautyfier is not available for the 0,06mm layer thickness :(
I think it ia usually ok to use the shared Artwork, as long as it is for your (/customers) private use and is not mass produced with financial intentions ;)
it´s lacking the golden parts MK XII has...
Also I must say that my padtato printed MK XIV looks better (except for fuzzieness of the print) :P
Pad-tato Prototypes by bricks @ raminator, on Flickr