Flexi Fidget Hand Spinner

- inspired by the suspension design of the mini monster trucks (https://www.thingiverse.com/thing:1557428) i decided to try and give my ball spinners some flex ;D
- still quite stiff, but thinner "springs" might make it to fragile
- based on D13mm stainless steel balls, which snap in place
- needs 1x 608 skate ball bearing and 6x balls
- model units are [mm]
- includes first attempt/design "flexi.stl"

***EDIT 09.06.2017*** new stl models added:
- "Spinner-Flexi_2_slim" with thinner walls for more flex (untested)
- "Spinner-Flexi_2_inch" for 1/2" (12.7mm) balls (untested)
- "Spinner-Flexi_2_slim_inch" (untested)

***EDIT 10.08.2017*** new stl models added:
- "Spinner-Flexi_2_tight" with normal walls and more embracing ball pockets (untested)
- "Spinner-Flexi_2_tight" for 1/2" (12.7mm) balls (untested)