Ready to make the jump from mechanical switches to inductive switches? The proximity switch upgrade kit includes everything you need to replace your original homing switches on belt-drive X/Z and HDZ machines. The Carbide 3D Proximity Switch Kit is a complete plug and play solution that replaces the mechanical switches on your Shapeoko 3. Note: Only machines with a Carbide Motion PCB version 2.4d or higher are supported. Shapeokos purchased from us in Feb. 2017 and later likely have a supported Carbide Motion PCB. If you have an older machine, or you're not sure what board you have, get in touch with support@carbide3d.com. Note: This does not work with the Shapeoko 4.