Sometimes, it's for the fun of it. Or because Prusa asks you to. Matt Denton, a veteran TV and film animatronics engineer, recently posted an inventive build that takes a 2 kg filament spool and turns it into remote-controllable robot, all while preserving the core functionality of being, well, a spool of filament.

It's the goofy kind of clever I can get behind. And you can, too – the full BoM and schematics can be found on GitHub, and the printable files on Printables. Denton's nearly hour-long build video is well worth a watch, too.