https://github.com/rubillos/RV-Bridge

A case will keep the microcontroller isolated from any exposed contacts inside the wiring panel.
Build Plate A textured build plate give a nice surface finish for the top and bottom of the box.
Filament
PETG - handles heat better than PLA and sticks to a textured build plate much better than PLA.
Settings to adjust:
Layer Height: 0.3mm (faster printing)
Extrusion Width: 0.55mm (eliminates tiny infill strips in the walls).
Perimeter Transitioning Threshold Angle: 20 (keeps the lettering connected).
Bridging Angle: 180º (bridging in the layer above the lettering should be parallel to the baseline of the text.)