# New CNC? After upgrading my 3d-printer, I have some parts left over. I’m not sure yet what I’ll do with them. What I have now: - Einsy Rambo 1.2b - (2) NEMA 17 1.8° stepper motor - "Original Prusa i3 Extruder" stepper motor - (2) GT2 belts, with pulleys and idlers - (4) linear bearings - (2) steel rods - (2) fans - LCD board - Hotend I'd love to give it some fun manual controls like with this [rotary macropad](https://blog.adafruit.com/2024/07/31/new-guide-cnc-rotary-macropad-3dthursday-circuitpython/) (see [[CNC-Macropad]]) some purchasable options: - https://proxxon-us-shop.com/products/micro-mill-mf-70?ep=no - https://www.sainsmart.com/products/sainsmart-genmitsu-cnc-router-3018-pro-diy-kit - https://www.proxxon.com/us/micromot/37110.php ## toolchanger I think I'd like this thing to have a toolchanger, but not in the cnc-mill style (the mill tool and collet), but the 3d-printer style (the mill motor too) ### [Jubilee](https://github.com/machineagency/jubilee/tree/main?tab=readme-ov-file)-style The Carriage is the part that rides in the x-y plane, and it has to be able to grab tools and drop them. For this it rotates a latch some degrees (<180). In order to rotate the latch it needs a stepper motor, but putting another motor on the carriage is bad (heavy). On a Jubilee the Remote Elastic Lock assembly controls the rotation of the latch remotely, by mounting the stepper motor on the frame of the machine, and using cable in housing for a flexible long actuator. So: - the frame has a lock motor - the lock motor has cable tubes over to the carriage - the carriage has a t-post latch thing that spins accurately - the carriage also has the passive bearings for the tool. - the tool also has bearings, for accurate contact. - the tool has a lock-plate that matches the shape and motion of the latch. - the other end of the tool has a parking post, for mating with the parking slot - on the opposite side of the frame from the lock motor, the parking slot mounts and cradles the tools. This design seems to have a few nice features: 1. the tool lock/unlock mechanism only needs 1 extra stepper motor, not one per tool. 2. the tools themselves use cheap parts for locking/parking, so each tool can be as cheap under this system as normal. 3. the cable-tube system lets the net-new motor not weigh down the carriage