This page describes my DIY laptop controlled 3-axis CNC Mill. It has been an amazing project and a fun build. The below table is a breakdown of costs associated with the project. The Proxxon mill I got was a return with cosmetic damage that was marked down from the original price. I used a stepper motor adapter kit to attach nema-17 motors to the X,Y, and Z controls of the mill. The nema-17 motors work well, but can slow down slightly sometimes. I may upgrade to nema-23 motors for more torque. The laptop I'm using connects to the stepper motor controller board using a parallel cable. The software I am using is Mach 3. So far most of the limitations I have run into are related to software. I have been able to mill metal using g-code. I have used a bit with 0.5 mm diameter and got excellent precision. I have also cut stepper motor mounts out of aluminum and brass using this setup. The Proxxon mill is capable of cutting steel and titanium metal. The control board and power supply a...