Figurines that just won't stay standing are the bane of a collector's existence, but spare a thought for hobbyists who design and 3D print their own models, only to find they keep toppling over. Now a ...

Consider the humble ball bearing. Ubiquitous, useful, and presently annoying teachers the world over in the form of fidget spinners. One thing ball bearings aren’t is easily 3D printed. It’s hard to ...