You could wire in the extra servo amp and motor to get the 3rd axis. the hard part is interfacing the motor to the quill. my 3 axis EZ-TRAK uses the cantilever design which is basically a gear box and a linear actuator hooked to the 3 bolt holes in the bottom of the quill. you could take the light bar off z and use an encoder for more accuracy. But better yet you can get a cnc head for this machine for $2500 then u just need motor and encoder and the servo amp. this setup would be alot more accurate. there is a design that hooks off the piece that the light bar hooks onto the quill. But i haven't found a kit for that yet. I'm not real sure but from my understanding of the system you could use just about any motor and servo amp that accepts a 0-10volt torque mode input and has a quadrature encoder output. but i haven't tried that yet. I have 2 of these beasts. One is a 2 axis the other a 3 axis. I do know the bmdc3 card is recomended for the 3 axis machines.