The University of Illinois has an interesting build of a cheap,

3D Printing
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1

The University of Illinois has an interesting build of a cheap, micro scale DLP resin printer. What’s nice is they actually tell you how to build it. I just checked the chemicals for the resin, and it may be $20 for hardware for the manual “printer”, plus a DLP projector, computer to run it, and then about $45 per 100ml of resin (average based on Sigma Aldrich lab grade web pricing, with about $100 buy in for the first batch).

http://nano-cemms.illinois.edu/materials/3d_printing_full.html

2

The projector probably needs to be bulb based as they’re taking advantage of the UV output, and if you’re mixing the resin, you need to start 3 days ahead of time.

3

Need to rip the UV filter off the lens base. Some bulbs are better UV emitters than others.