The video really needs to be seen to do this justice. The way this works is pretty difficult to describe by words.
(Creative commons license NON COMMERCIAL. You MAY take this model, and add, modify, etc, provide Remix links etc and re-upload here on Thingiverse for free. You may NOT use this model to create something to sell on Etsy, or other online locations. That right is reserved. Sorry.)
Printer Brand:
Creality
Printer:
Ender 3
Rafts:
No
Supports:
Yes
Resolution:
.20
Infill:
15-20%
Filament:COEX PLA (PETG might be best for long term resiliance) Inferno Orange
Notes:
Supports only needed for the tiny, tiny, TINY lip at the very bottom. The entire inverted FITS slot does not require supports due to the 45 degree angle when printed on the circle's back.