Sand Pendulum

thingiverse

Saw a much larger version of this at a museum a while back, and finally decided to build one myself. Was surprised that no one had designed one yet (at least that I could find). This is the revised STL file. Printed one instance already and adjusted the files with things I learned from it. Used https://www.thingiverse.com/thing:2626110 for the sand holder, scaling it to 66% of normal size and it's perfect for this model. The entire model had to be scaled to 93% because some details weren't properly accounted for, causing the top to exceed my printer's max volume. After printing both parts, glued the top onto the four towers. Be aware that the top is best printed upside down to achieve a smooth surface and eliminate supports entirely.