This is a cool object that has 2 parts that simply glue together and pops right onto a Christmas string light! Print a base and a star (see the bottom of the description to choose a size) , glue the smaller side of the base to the hole at the bottom of the star. Once dry, slide the larger side onto the light and you're done! If you print it hollow(0% infill) with translucent filament, you have a lit up star! If you wanted star light but could find them, this is easy. No Soldering or buying LEDs. At night, this looks really bright.
The files ending with "Base Big" are larger and fit the string light with a slightly larger diameter than usual(mm) such as some Christmas trees. The files ending with "Base Small" fit the smaller lights that are more commonly available. Use any size star you want, big or small. Depending on how bright your lights are you can choose. If you have incandescent light that is dim, use the smaller size star but brighter lights such as LEDs can use the big stars.