This pinhole projector will allow you to view the eclipse during the partial phase. As the light passes through the holes of the paddle, you'll see crescent shaped projections as seen in the photo.
I had to print this on my Sovol SV06 Plus since it was too big for my A1 mini.
It printed well - I was worried about all the little holes but there was no problem.
Worked great, with clear crescent patterns on both a deck and a Labrador.