I created these for all our spinners because the existing caps I found were either too wide, male/female sets that were a pain or were touching the bearing shields. With these dished caps you can really get a good spin going without risk of dropping the spinner...
Supports set at 10% fill (almost not needed but keeps the edges nicer)
.1mm from Z
.2mm from x/y sides
I printed at .1mm just for the prettiness...they do well at .2 also