Roomba Bit

In the "it would be a shame to buy a new machine just because of one broken little piece, when it could be so much fun to design and home-print a new one" series, a nerdy friend of mine has one of these robotic vacuum cleaners, and a small bit is unfortunately lost or broken or whatever (missing, anyway).

It took several tests, and it seems the piece we have now fits exactly and is ready for duty. :)