This is my take on a deej case. If you don't know about the project check it out on GitHub here you can also find the wiring diagram.

Part you will need:

• Slider potentiometer 75mm (5pcs)
• Arduino Nano Usb-C (1pcs)
• M3*8mm (4pcs)
• M3 heated inserts (4pcs)
• M2*12mm (10pcs)
• Wire

Optional

• M3 any size up to 8mm (1pcs)

To wire everything please look at the wiring diagram linked above.
The optional screw is for securing the arduino but it can also be held in place with a little bit of glue.
If you want a version without the heated inserts or maybe even with a snap in place lid pleas leave me a comment.

Creality

Ender 3

No

No

0.2

50

I printed everything with 4 walls, no top and bottom layers and 60% triangle infill to save time and filament, but mostly because it looks super cool and you can see the led of the arduino threw it. You can also add a few additional leds if you'd like.