Stepper-mounted drive pulley for 6mm GT2 synchronous belts provides linear motion for FirePick. The number of teeth affects accuracy and torque. Smaller is better and 20 teeth gives about 0.2mm resolution for a stepper having 200 steps/revolution.

@Sources

• http://www.adafruit.com/products/1251

• For more money, you can get finer resolution by using metal GT2 timing pulleys with fewer (e.g., 15) teeth (https://sdp-si.com/eStore/Catalog#)