Prepare CircuitPython according to this instalation.
https://learn.adafruit.com/welcome-to-circuitpython

Design the enclosure to match toggle switches to be used.

My 3D printer doesn't have enough work area to output at once, so I designed it to be able to print out separate pieces and glue them together.

Install toggle switches and pico, solder as shown in this schematic.

It is not important which pins are wired, as it can be easily modified in the firmware.

code.py is here.
https://gist.github.com/hsgw/db5753c29c71fa35bb79a933cf316e77

The "adafruit_deboucer", "adafruit_ticks" and "adafruit_hid" libraries are required.

Debugging code can be used to verify that all switches are working well on your serial monitor.