We've been printing with PMC on the Hyrel printers since last summer, but here's the concern: the medium itself (PMC) does not lend itself to very think layers, or very small features, due to its thickness. It's not a matter of the precision of the printer, but the viscosity of the goop you're printing with.

You want a big, round amulet? Good choice.

You want an engagement setting for a diamond? Bad choice.