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LiteFab is an rugged open source DLP 3D printer you can build yourself at a low cost and which comes with an excellent step-by-stem construction guide. The cost for this project is some 400-500 USD plus the DLP projector which you can buy new or used which will cost you some 50 - 1000 USD extra. For this build the developer used Acer h6510bd.
Here's an example of a new (to me) source of vector art for rendering on a polargraph: "sliced" 3D models. I noticed that Slic3r (a program used to process 3D meshes for 3D printers) has a "slice to SVG" feature. -*lightbulb over my head*- There are quite a few hoops to jump through to get a set of vectors that are useable, and the visible smudges on this drawing show that I should have jumped ...