This is ARGB light bar for WS2812B LED strip, I designed it to fit in my SilentiumPC Signum SG1V PC case, but I'm sure it will fit many other cases.
Light bar supports 33cm length LED strip that's up to 10mm wide. I used 30 led's/meter strip (so 10 LED's in total), but it will fit 60 led's/meter and other just fine.
Essential components: WS2812B LED Strip (only need 33cm) - https://aliexpi.com/gh4A ARGB connector - https://aliexpi.com/ULXj Double sided tape - https://aliexpi.com/4h0w Hot glue and glue gun
Just solder ARGB connector to LED strip according to included schematic, hot glue LED strip to printed part (dont worry about getting glue on LED's if your glue is transparent) and stick it wherever You like with double sided tape. Connect LED strip to ARGB controller or motherboard connector.
Important! - You must use raft or brim for the part to prevent warping.
No need for supports, but remember to have chamfered edge on top - this is left angle part.
I printed it with transparent PETG with 2 walls and 15% infill, it's just 15g of filament.
It will fit ender 3 print bed, just rotate the part in slicer.