This is a simple 2 piece print. The diffuser should obviously be printed in white or a light color filament. The case is best printed in a dark opaque color to avoid any light leaking out.
The hole for mounting takes an M5 screw. Feel free to figure out your own mounting system, but this was originally designed to work with the Modular Mounting System over at Thingiverse:
https://www.thingiverse.com/thing:4619937

You can get a 4-pack of the LED arrays on amazon for about 13 bucks, US:
https://www.amazon.com/gp/product/B07XT5Q4VY/
Just note that they require 12 volts so if you try and power them from a 5-volt power supply, you will need to step up the voltage. I just used one of these:
https://www.amazon.com/Valefod-Efficiency-Voltage-Regulator-Converter/dp/B076H3XHXP/
The author marked this model as their own original creation.