Assembly 

Assembly instructions are given in the manual PDF file.

Material 

Apart from some filament, you will need the IKEA LIVBOJ (~5€) and two low-profile key switches.

Design

The ring units are printed with two color changes and the light blue highlights are painted.

Inspiration

I was inspired to design this switch by the wonderful Ellindsey's Companion Cube model. So if you don't need to charge your phone, the Portal Switch is a good place to store your companion cube ;)

Reference 

https://www.ikea.com/de/de/p/livboj-ladepad-schwarz-40447051/

https://mykeyboard.eu/catalogue/kailh-low-profile-choc-switches-white-10-pack_3218/

https://www.thingiverse.com/thing:173570