What's Eric working on these days [or at least occasionally]?
An attempt to design an interesting and educational kinetic sculpture that's also a functional 8-bit CPU.
A Firefox [deceased, sadly] and now Chrome
extension that turns every textarea into a very Vi[m]-like environment.
A maze generator that uses a Voronoi diagram and Delaunay triangulation to
generate a maze from random points [so as to avoid having a clear x-y or hex
A tool to help designers of end-grain and edge-grain cutting boards.
A tribute to [and expansion of] CBdesigner.
...which can't be designed by the above tool.
If you want one that's a bit more polished try Joost's. However, we both use
the same underlying library, csg.js, and it's not designed for 3D
printing. It produces shapes that look perfectly good, but aren't proper
manifolds. To fix this, I hacked together a quick
fix that you're welcome to use under the MIT license.