This is a simple Mario Star Charm that uses an off the shelf LED insert. Its super quick and easy and light up jewelry makes for a fun accessory for special events, especially at night! You could also use this as a Christmas ornament too. Overall size is ~2" square x 1" deep.
**Material & Settings:
Translucent PLA or PETG plastic. I use this brand https://amzn.to/2FPthIJ
Supports needed (Star to lay on its back facing up)
0.4mm dia nozzle
0.2mm layer thickness Max
2 Perimeters all sides top & bottom
15% Gyroid Infill, everything should be solid.
1x LED Light: https://amzn.to/2G0iaOu
(It is cheap and still decent quality. Its water resistant, has a twist on/off, and batteries are 'supposed to' last up to 72 hrs. To turn it on the first time you have to unscrew it and remove the paper insert that keeps the batteries from turning on in the package. They are sold for inserting into balloons or paper lanterns but they are a great starter part for jewelry! The clear rubber ring on the outside keeps water out and the friction keeps the cap from separating when you have the light turned off. It will still function without this rubber piece if you don't like it.)
Necklace: Obviously there are many options but the loop on the LED is pretty small so I used a 1.5mm chain. https://amzn.to/2TSDEAp
OPTIONAL: If you make this as a Christmas ornament then you can just bend a paperclip into a hook!