Pulleys may be created and used for 3d printing or machining with our 4th axis methods. Since most do not have 4th axis available, it is possible to cheat some with these, toolpath the gear and collar in 2D, do this via Gearotic 3axix milling then send to to your CNC table to cut them out. Next you add collars on both sides to complete the gear, as oppose to making it all in one piece? It isn't perfect, however often works as a work around. Various options exist, including a pull down library of some of the most popular pulley types. Once selected, you may then use the belt calculator inside Gearotic to determine the belt lenght from your pulleys in your design. If you find a pulley type missing in our library, and you know the specs of it, send us an email we'd be glad to include them.