These are a couple of gyroscope fidget toys I designed and after playing with/testing them I think they are ready to share! Both the disk and cog at 100% are about 80mm in diameter and 24mm tall. I've experimented with scaling the full sizes down and have gone to 60% but you may have different results depending on the printer and settings you use.

0.4 or 0.6 nozzle, No supports, 3 perimeter walls, 0.2 layer height, 10% infill, is what I used for testing.