Arduino Mega with breadboard mount

thingiverse

To secure the Arduino, press it firmly into place. The fit is deliberately tight to prevent it from coming loose. Don't hesitate to push the Arduino hard to ensure it's seated properly. I drew inspiration from this design: https://www.thingiverse.com/thing:1815636. However, I made some modifications - I eliminated the need for screws and repositioned the Arduino to accommodate simultaneous printing of two models on my Ender 3.