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Say I've sculpted something, but it's not the right size. And say it's intended to be an add-on part to a bigger something which is the product of digital modeling. Naturally, being hand sculpted, my something lasks the sharp edges and fine detail of the digitally designed something. I would love to hand my something to someone and say, "please scan this, clean it up, and produce a single 3D copy at this particular scale."

Can this be done (I think it can), and if so, who should I talk to, and how much would it cost?    

It can be done and it would cost you an arm and a leg. 3d scanning complicated geometrics still takes a lot of cleaning. Much easier would be to learn 3d or get someone do it and then have it printed somewhere.

I have acces to my School's Rapid Prototyping machines and even using them is dead expensive, particularily if the medium and quality are tops.

I'm going to second Migs here- rapid prototyping is three or four types of expensive, and you would be requiring the level of detail that few machines are capable of. I wouldn't be the least bit surprised if it cost a few thousand dollars. Best to simply resculpt.

Bummer. I gave up on learning 3D a long time ago. Simply no time.

Elusive, much easier to have a 3d model, than to scan.

rapid prototyping on the other hand is not as expensive as you might think for a master model.  Here for example, is someone working on 6mm macross models. 

http://www.star-ranger.com/forum/viewtopic.php?t=2534&postdays=0&postorder=asc&start=0