In this grasshopper definition you can model a simple parametric rotating mechanism. you can actually change the handle’s length , width and also control the rotation speed.
UGears is the creator and manufacturer of unique self-propelled mechanical model kits designed for self-assembly without glue and made entirely of high-grade wooden material.
This spinner toy by Mozi slips over your arms and spins in mesmerizing patterns across it. Roll it from arm to arm or friend to friend. Then, once it’s made its rounds, just fold it flat by turning it counterclockwise between your hands. Its smooth, caterpillar-like movement works best on bare skin.
Henry Segerman is putting a new spin on the subject with his emphasis on mathematical art. Instead of teaching math the old-fashioned way (i.e. boring old pen and paper), Segerman makes use of 3D printing videos to illustrate how mathematical concepts like geometry and symmetry work.