The HobbyCNC PRO 3 axis board is a “depopulated” 4 axis board. With the 4th axis upgrade kit, you can add the remaining parts to add the final axis.
HobbyCNC PRO 4th Axis Upgrade for our 3 axis HobbyCNC PRO Rev1 driver board kit (only).
Contains all parts necessary along with step by step instructions.
Available on backorder