Rotating Dice

myminifactory

This was totally based on these nice and well machined rotating dice: https://www.youtube.com/watch?v=r2N7ZlqV9eQ To make one, you'll need: 4 small bearings (3x10x4 mm) like these ones:https://www.amazon.com/Fishing-Shielded-Miniature-Bearings-VXB/dp/B002BBF59C 14 little magnet spheres (3mm):https://www.magnetstore.co.uk/neodymium-sphere-magnets/3mm-sphere-magnet/ one 45mm length metal rod, with 3mm in diameter. I used a 2.7mm, since I don't have apress to fit the bearings tightly in the rod. By rule, the tighter, the better. I think 2.8mmwill work. I don't have a lathe either. two 16mm length screws, 3mm diameter (M3). Print the parts with 0.1 or 0.2 layer height. I printed the parts with 20% infill, 3 shells. The dice discs were printed with 50% to give them some weight and moment of inertia. I've printed the supports with the drawings facing down. Try reducing the perimeters to one in the first layers. I found that the surface comes out more visually interesting. Just an opinion… Snap the magnets by pressing them against the proper holes (indicated in the image) with a hard surface (a ruler, for example). The magnets holes were made to let the magnets free for spinning, to ensure the attraction force between them (not repulsion). Depending on how the magnets balls were made they can have magnetic poles changing across its surface - or from inside to outside. So, if you get the first type, they will spin and attract each other.The images show the order of assembly. The toy makes a nice sound when spinning. There is a small margin of error, it can stop between numbers, but it doesn't ruin the funny experience. Video here: https://youtu.be/ZFF2bTKgedE   There are 3 versions of the supports: 2 with drawings and 1 flat. I've made a version with one dice: https://www.prusaprinters.org/prints/74097