This is probably just about the smallest triaxial tourbillon mechanism that one can reasonably make with a .4mm nozzle. It's powered by a sping motor at the bottom an fits within a 96mm sphere. The only non-plastic parts are a couple of M3 bolts (somewhere between 4 & 12) and a 1.5mm shaft.
Using one of each of the provided 3mf files total print time is about 22 hours with maybe 1 hour of active assembly time.
See assembly video for build instructions. 3D Printed Mini Triaxial-Tourbillon Assembly - YouTube
See it in action: 3D Printed Mini Triaxial Tourbillon - YouTube
The author hasn't provided the model origin yet.