An AC servo motor (DMM Tech DYN4) replaces the stock BLDC spindle motor on a LinuxCNC retrofitted Precision Matthews PM-25MV milling machine. Video shows 3D printed motor mount, keyway broaching on a lathe, and initial testing. Second video will be of the aluminum mount, timing belt and pulleys, and the electrical. 3D printing motor mounts could bootstrap a spindle motor replacement in an emergency. Checkout part two to learn if the 3D printed parts stand up to milling forces.