Pinhole Projector

I couldn't find a simple pinhole projector that would do multiple projections, so I made one. The main version has 81 pinholes, the x1 version only has 1 pinhole. I scale it in my slicer to be 100mm x 100mm x 1mm, which takes about an hour to print the 81 hole version at 0.2mm layer.

Warning, this will not protect your eyes from the sun at any time. Do not put this between your eyes and the sun.

Just hold the thing up and let its shadow hit the ground. Where the light comes through the pinholes, you will see a projection of the sun. If the sun is being eclipsed, you will see the corona of the sun.