This is a Remix of the Vent Ring for the Ender 3 by Filboyt.
See his versions here:
https://www.thingiverse.com/thing:2912394
https://www.thingiverse.com/thing:3343456

In this version I added holders for standard LEDs (5 mm diameter) in order to have a better look at the print while it is printing.

I used 4 blue and 4 white LEDs that have a 3 V voltage drop. This way i could solder them in series and directly connect them to the 24 V power supply of the printer.

The tips of the LEDs were too long so I simply clipped them off with a pair of pliers.