New Open box. Discover the Possibilities: The Genmitsu 4th Axis Rotary Module Kit is a drop in upgrade that enables your 4040-PRO, 4040 Reno, 3030-PROVer MAX CNC machine to carve from different angles and positions or with the right software full rotary carving. The 4th axis allows for the creation of complex parts with curved or angled features that are not achievable with a traditional 3-axis CNC machine. Additionally, the G-code for the 4th axis must be sent using an offline controller (ASIN: B0C582HQ6Z), which should be ordered together with the 4th axis to ensure proper functionality (For the 4040-PRO only, the 3030-PROVer Max comes with the offline controller already installed.)