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NEMA 17 Reaction Wheel With M5 Rim Weights
A 120 mm reaction and inertia wheel for a NEMA 17 stepper's 5 mm shaft. It clamps on with an M3 set screw and a captured nut in a 16 mm hub. Twelve M5 clearance holes on a 106 mm bolt circle in the rim have 8 mm hex-nut recesses, so you can add M5 bolts, nuts and washers to put mass at the rim and tune inertia and balance for self-balancing cubes, inverted pendulums or hand-crank flywheels. The heavy 14 x 10 mm rim sits on a 3 mm windowed web, so most of the mass is at the outer edge.
Ceiling Fan Blade Balancing Clip
A slide-on balancing clip for fixing a wobbling ceiling fan. Its flexing jaws grip blade edges 4–7 mm thick, and a hex well holds a stack of M5 nuts (8 mm across flats) as trim weight. Clip it to one blade at a time and slide it along the blade until the wobble stops. The nut count tells you how much weight to fix permanently. It's 48 x 15 x 20 mm and the jaws are printed flat, so they flex along the layers, not across them.
Flagged: a sharp edge or blade. Not for safety-critical use without independent engineering review.