Slashme, CC BY-SA 4.0, via Wikimedia Commons
I updated an existing Tinkercad design to create a part to securely hold a Raspberry Pi 4 and small breadboard.
Original design
https://www.tinkercad.com/things/8k21OQvUnlh
Updated design
https://www.tinkercad.com/things/fQPX9bFkoC3-raspberry-pi-4-and-mini-breadboard-mount
Updated design
Sliced part
M3 Tap Drill
Finished assembly