Stand for the Picoboot mod (Raspberry Pico on Gamecube) with a slot for a M2 insert on the left and a pin on the right.
You obviously need an insert for a M2 screw (as seen on the picture of the stand alone) and a M2 screw.
UPDATE: I added a version with included support for the pin (easily removable after printed).
UPDATE 2: M2 size I used is M2 x 4 x 3.5:
The author marked this model as their own original creation.