Supersize Rotary Fidget

thingiverse

Here's the latest creation from Nalan Engine LLC - a revolutionary rotary fidget toy that boasts an impressive 100 mm OD, dwarfing its predecessor, which measured only 60 mm OD at http://www.thingiverse.com/thing:2135945. The larger radius of the spinning mass significantly increases inertia, resulting in longer spin times. The vertical ribs have been eliminated to minimize aerodynamic drag, and bridges have been strategically placed between the spherical ends to eliminate wake turbulence. While it may not be as convenient as its predecessor, this fidget toy spins longer and is quieter. This innovative design relies on three 8x4 miniature ball bearings for smooth operation. Five 1/4”-20 crown nuts (10.8 mm hex by 7.6 mm tall) are securely embedded within the flywheels to provide additional inertia. To assemble this fidget toy, print and de-burr two flywheels, as well as two thumb knobs. Insert the nuts into the flywheels and glue the two halves together using CA glue for ABS materials. Install the bearings, shaft, and thumb knobs. You'll need two 3x8x4 ball bearings and one 3mm diameter, 40 mm long shaft (which can be sourced from old floppy drives) to bring this fidget toy to life. With proper assembly, it should spin for approximately 45-50 seconds. To experience the mesmerizing effects of precession, hold the fidget between your thumb and index finger, give it a good spin, lift your index finger, and have it rest on your thumb only. Happy printing! Don't forget to check out Nalan Engine LLC's website at www.nalanengine.com for more amazing creations. You can also explore their awesome printers at the same URL. For an in-depth look at this fidget toy in action, be sure to watch https://youtu.be/_Al1Ib2DuH8