These are star shapes to be used with the 'Stars and Stripes' prop created by Charlees Props. There are 2 variants of star shape included, one that shows the pixels through the star and one that completely covers the star.
Multiple files are included with the download. The 'Project' files are Prusa Slicer 3MF projects that can be directly imported.
No special print settings should be required but here's what we use:
The stars have a center prong that fits into the hole created with the guide/punch. I found that it was helpful to use a small awl to slightly widen the hole just before seating the star, then push the center of the star to engage the prong into the center hole. The coro will bounce back slightly, which should hold the star relatively tightly. You could also put a drop of super glue in the hole just before seating the star, but I didn't go that far (yet 🤞).
You can see how effects look on both types of stars in the video below:
And here is video of all 50 stars with full caps installed: