Simple Mechanism to draw Infinity Symbol

[@nathanphillips7787]

Not sure what provides the motion lateral to the piston.

[@khalidal-khashin1125]

Thanks for your comment
One can mount the motor to a fixed base , where the axis of the shaft of the motor and the axis of the fixed hinge of yellow oscillating link are collinear, then transmit it's power by belt or chain to the hinge between the oscillating link (yellow) and the blue .