Walls are multiples of 0.6mm, so I suggest printing these using a extrusion width/wall width of 0.6mm/1.2mm. 0.5mm/1.0mm or smaller will increase print times and give you weaker parts.
Before printing all the diffusers I suggest printing the single one and test if it fits nicely. Don't squish the first layer too much on the frame or diffuser files!
After wiring the led strips I strongly suggest running the test-INO before completing everything (rtc, arduino, case, power wiring and so on).
Of course you can use other led strips as long as they aren't much thicker, 10mm wide and you know how to program them
The case will fit an Arduino Pro Mini OR Arduino Nano. No usb breakout as I'm only using pro minis for stuff like this...
Requirements: 1 Arduino (Nano or Pro Mini) 1 RTC module (DS3231) 99 WS2812 LEDs, 60 leds/meter, 2x 47pcs, 1x 5pcs 2 button switches, 6mm 1 resistor (300-500ohms) 24 screws (M3, 6-10mm) lots of wires Working Arduino IDE Basic knowledge of what you're doing