v-groove pulley for 28BYJ-48 stepper motor

This is a pulley I've made for my polar drawbot. I have printed it, and done a lift test. Using thread and a 120g weight it runs smoothly.

I am using an Arduino with AccelStepper (setMaxSpeed 1000, setAcceleration 100, setSpeed 200).

It can be tuned by changing the openSCAD code.