We’re not sure how useful this is as an object, but the tolerances on this little toy, from Thingiverse user MishaT, are so small that it makes an excellent test to see if your printer is calibrated properly. Download and print your own from http://hsmag.cc/fsKgdS
3D print your own nautilus gears
By Andrew Gregory. Posted
This looks like it shouldn’t work, but it does, and we’ve spent far too long playing with it. The two gears are non-uniformly shaped, but they’re put together so that the widest point of one gear exactly meshes with the smallest point of the other one.
