Summary

The original design came from here: https://www.printables.com/model/1231915-push-to-talk-switch-ring/files

I found the push button hole was too small for my needs, and slightly increased it.

For push button I've used these ones: https://www.amazon.co.uk/dp/B0825RCZJS?ref=ppx_yo2ov_dt_b_fed_asin_title