For best results, print the top of the base upside down (on its largest face), and the mug flat on its largest face.
The bottom base can be printed with or without supports - it has two arms and a hole designed to fit a standard 12V DC barrel adapter like the one(s) found here, which may work better if printed with supports, but I've also printed without.
I printed the mug in PETG because I've had issues with some PLA deforming/sagging under the slight warmth and weight of the LED strip in other designs.
The LED strip(s) I used can be found here. They require a 12V DC adapter of at least 2 amps (see the specifications on the product page - 2 amps is enough for the length used in this sign) like the one(s) found here.
The author hasn't provided the model origin yet.