My Design of a buttonbox for a 2020 aluminum profile on my modded Ender 3. The buttons are connected to my raspberry pi running octoprint with the physical button addon.

The micro buttons are soldered onto a perforated board that I previously cut to the right size. I also connected a pull-down resistor to GND. Each button is connected to its own GPIO PIN on the PI.

Addon: https://plugins.octoprint.org/plugins/physicalbutton/

Buttons used: https://www.amazon.de/gp/product/B07Q1BXV7T/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Breadboard used: https://www.amazon.de/gp/product/B07BDKG68Q/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1