Little light box I designed. Uses the following parts:

LEDs:
https://www.amazon.com/dp/B077XBW45S?psc=1&ref=ppx_yo2_dt_b_product_details
Battery Holder
https://www.amazon.com/dp/B013GNC08C?psc=1&ref=ppx_yo2_dt_b_product_details
Switch
https://www.amazon.com/dp/B07L74MMG8?psc=1&ref=ppx_yo2_dt_b_product_details

Use a clear filament, or opaque as the first 2mm of the cross front, then switch to different color to let the LEDs shine through. I use 4 LEDs and the battery's last a very long time

Creality

Ender 3

No

Yes

0.2

10