Update 20.03.2024:
I added a support layer to the lightbox to help keep everything together. print it in white.
I worked on the 3d model that you dont have so many little holes when printing with a 0.4mm Nozzel. These little holes are cuase by all these steep angles. My print profile is pretty good but you might consider using a 0.2mm Nozzel.
Have fun printing.
Electronics:
I used a 12V LED light strip, a DC barrel connector, a 12 V power supply and some wires
The power supply and the DC barrel connector I used
https://www.amazon.de/dp/B016LV20X6?ref=ppx_yo2ov_dt_b_product_details&th=1
https://www.amazon.de/dp/B09PD6J4BN?psc=1&ref=ppx_yo2ov_dt_b_product_details
Assembly:
For more details check this light box.
https://makerworld.com/de/models/60268#profileId-62430