Balance weight for fidget spinner

thingiverse

The design itself is hardly worth discussing: a simple cylinder sized to fit in a 608 bearing. But the reason for it is a little interesting. I noticed my printed spinner had a pronounced vibration at certain speeds. Using an ungreased ceramic bearing, it had a tendency to turn the same side down when held vertically. I weighed the mass bearings with a [centigram scale](https://www.amazon.com/gp/product/B003O5K3JQ) ($14 on Amazon) and found that the heaviest one was nearly .3g more than the lightest one, or about 2.5% heavier. I printed three of these at different infill settings, and after some trial and error was able to get the combined weight of bearing and weight to within .02 g. No more vibration. The heaviest one at 100% infill comes out to .35g in PLA. The lightest one I printed with no infill and a single perimeter weighs .08g. If your weight difference is more than that, you may have to leave one out.