[marktwain]

Can 3D printing hold +/-.0002” tolerances?

It depends. I see at least one machine in production which claims 1 micron (about .0004" tolerances). The field is rapidly improving. I might be able to give you a good answer if I were an industry insider.

[know.your.why]

I see at least one machine in production which claims 1 micron

If so, that is truly amazing. Production times have to be sky high at that tight of resolution I bet. But just imagine...having overhangs and tall-thin webs and holes that dont have line of sight access for traditional machining methods. Cooling ducts with no mating part and no gaskets. No debur ops. No chips!! omg...Back spotfaces. Raised/recessed text in areas to aid assembly. Thats a mfg engineers wetdream. I'm getting moist. I wish Kelly Johnson was alive to dream stuff up with this tech.