This is a case for one or two toggle switches.

The outer shape is based on a generic emergency button.

Upper and lower part are connected with M3 screws, the lower part has brass hot melt inset nuts.

Edit 1 (2021/02/25): The holes are for common switches with a diameter of about 12 mm. If your switch doesn't fit, download the Fusion 360 file and change the diameter. It is really easy. The switches I used are these: https://www.amazon.de/gp/product/B01FHLPOK2

Edit 2 (2021/02/25): And here are the insets I use: https://www.amazon.de/gp/product/B08PV3R86P or https://www.amazon.de/gp/product/B08BCRZZS3.