Risu is right. I ordered the sonic head in Stainless and it was a little smaller than it should be because of the printing process. I've also ordered the tennant body, the aztec body and various caps in alumide, white polished, and black detail and they all printed fairly accurately.
If you want to order them in a plastic and finish them in rub and buff. I might try alumide, since it's smoother than normal white and it would have a silver base to work from. Risu, if you do this, let me know and I'll send you an extra glass blue lense.
-best
Dan