This is a pinhole viewer. It is possible to use it to project an image of the Sun (or a bright light source) anytime. The hole shape does not affect the image. if the hole is small enough the image you get is of the light source. When used with the Sun this means that both holes will produce a round spot. During the partial phases of a solar eclipse a crescent Sun will be projected. In this way the eclipse can be safely viewed. The hole is NOT for looking through the holes towards the Sun - NEVER look at the Sun without proper solar filters. Instead hold the shape facing towards and roughly parallel to the Sun with your back roughly to the Sun pinhole images of the Sun will be produced in the shadow of the viewer. There is a good focal point, so move the viewer to find it. Also, a smooth surface is better than an uneven one. I sized this so that I could print 4 at a time on my Prusa iMK3s. The second file has the text fixed thanks to the user who made this make: https://www.thingiverse.com/make:1172586 . The one with the fixed text has only one pinhole, instead of two, and the text is larger and prints better.

This object was made in Tinkercad. Edit it online https://www.tinkercad.com/things/fTwCTgssjPs or the updated version with fixed text at https://www.tinkercad.com/things/anfYCdVGpHO-2024-total-solar-eclipse-ohio-pinhole-viewer-fixed-text

The two tone print was made using the filament swap method.