The Infinite Hyperboloid Marble Track, Spinning Pen Holder

thingiverse

The Infinite Hyperboloid Marble Track, Spinning Pen Holder Marbles on the hyperboloid spin round and round through tracks that never end! This design brings together three previous projects - the hyperboloid, marble rings, and linkage bars. It's a versatile creation with multiple uses: a bottomless hyperboloid holder, a revolving holder with a base, or an infinite marble track. Watching kids try to put marbles into the hyperboloid pencil holder in a previous project inspired me to add two donut structures at both ends to create an infinite hyperboloid marble track. To connect the terminal parts to the main body, I referred to the snap-in design used earlier. Marbles with diameters between 10mm and 16mm can be used. You may need a lot of marbles to fill the tracks, but there's no need to do so - experiment with ¼ or 1/3 (about 30 to 50) and see how it works! Alternatively, using only one cap results in a revolving pencil or pen holder that holds pens with diameters between 10 mm and 16 mm. Warning: Once the end parts are snapped in, they're really hard to remove - which might be a good thing! A looser version is provided for those who desire it. Have fun and stay safe! See Also: 1. Hyperboloid Pencil Holder/Cable Organizer: https://www.thingiverse.com/thing:3757579 2. Marble Rings: https://www.thingiverse.com/thing:3159072 & https://www.thingiverse.com/thing:3160114 3. Snappy Linkage Bars: https://www.thingiverse.com/thing:2822460