https://www.youtube.com/watch?v=sin-YGmg8Cw

The additional costs for the kit and the USB socket are very low EUR 2.09!

LED-Podest-oben should be printed at 0.1 layer height.
Top layers should be at least 7.

For non-translucent filament: Use the File LED-Podest-oben-Version_0,5.stl
Top Layer here at least 5

Required parts:

Micro USB socket (5 pieces about EUR 1, -):
https://www.ebay.at/itm/5Pcs-Female-Micro-USB-zu-DIP-Adapter-Konverter-2-54mm-PCB-Breakout-BoaAB/153090448632

DIY kit (cost: about 1,09 EUR):
https://www.ebay.at/itm/Circular-Lamp-Suite-12PCS-LED-Blue-DIY-Kit-Perfect-Electronic-Production-DIY/272806199759
Solder LED connection legs as high as possible so that the LEDs fit into the holes.