Sand Pendulum

Saw a much larger version of this at a museum a while back and finally decided to make one for myself. I was surprised that no one had designed one yet (at least that I found). This is the revised STL. I printed one instance already and adjusted the files with things I learned from that. I used https://www.thingiverse.com/thing:2626110 for the sand holder. I scaled it to 66% of normal and it's great for this model. The model as a whole I had to scale to 93% because I didn't properly factor in some things and the top was over my printer's max volume. After printing both pieces I glued the top onto the 4 towers. Be aware that the top is best printed upside down for the most smooth surface and for eliminating supports.