Customizable locking rings

Makes Rings with a simple overlapping hook to hold them together.

I have uploaded some samples. 12/2021 updated code to flip for print. Fixed alignment and added customizer sliders.

The openscad script can be customized to generate custom rings of your choosing.
* square or round
* Diameter
* thickness

============ Support Notes ===============
Round ones you should probably brim if you have troubles with small contact surfaces breaking free.

You don't need supports in most cases.

For really small rings consider a lower layer height... like when sub 1.5 to 2mm thickness

=========== Material Notes ===================
It works well with PLA as it is rigid with some spring.
I have been printing at 20% fill.
Remember if you go too low on fill, PLA can take on its new shape with time loosing its spring.
For PETG you may want to set your fill higher and/or use thicker ring. I have not printed any yet.
I have not tested other materials.

ROUND vs SQUAR