Cycloid Spinner

Cycloid Spinner - a mesmerizing 3D-printed fidget toy built around a cycloidal gear mechanism. Spin the central gear and watch the inner discs orbit in hypnotic, rolling-circle motion. Fully printable, no supports needed, press-fit assembly - no glue, no screws. Assembly Instructions: Insert the central shaft into the center hole of one of the hypocycloid discs. Place the second hypocycloid disc onto the axle and check the markers on the side to confirm correct alignment. Slide the 4-arm plate down over the axle so its pins drop into the disc holes. Drop the assembled disc stack into the ring housing. <img src="https:/