We've seen Ben disassemble a laser printer, building a lightbox/table with old laptop screens, etc. so I was thinking it'd be great if he could grab some more parts, maybe from a recycling center, and build most of an FDM 3D printer from those scraps.
Of course we would see him going to the place and choosing what to buy (probably old printers and scanners). The whole process could go for (and I guess it would take) more than 1 (or 2, or 3) episode(s).
The challenge would be using the most junk he could in the build, which would probably leave out the hot end of the extruder.
There are some examples around the web, but I'd love to see Ben's take. 
Heckendooooorn! *shakes fist*
