Spacer for fidget spinner

A spacer for fidget spinners that use 608zz skateboard bearings which lets you use 5/16 hex nuts for weight instead. This prevents the 'waste' of bearings. Plus, spinners seem to be easier to spin and spin faster as well. Print at 100% scale and use a vice to press the bearings in. I designed these so that they're easily removable from the spinner, if you want to put bearings back in. 20% infill is good enough, with 2-3 top and bottom layers and 2 or more perimeters.