Velleman K8200 dual Z motor

thingiverse

Edit 12/06/19: Added Pictures of the finished solution. I've been searching for a great way to make the Z axis move up and down. I tried a dozen different designs, but none of them met my expectations. Now, I've designed my own version, and it's in many ways the best one yet. It's easy to print, stiff, and easy to align. Almost nothing can go wrong with this design. To assemble this mechanism, you'll need to print two identical parts. You can choose between using TR8 leadscrews or SFU1204 ballscrews. I've designed it so that you can mount the motors either at the top or bottom of the Z axis, as there are mounting holes in both ends. One option is to home the Z axis to its maximum position like a Prusa-style 3D printer. This will give you more precise control over the movement of the Z axis. Keep in mind that this design has tight tolerances. To ensure it works properly, be sure to calibrate your E steps, flow rates, and horizontal expansion before printing this mechanism. Once you've checked these settings, double-check them again to make sure everything is correct. Other than that, this design is relatively straightforward to print. I printed mine at a speed of 80 mm/sec. I hope you like this design and find it useful for your own 3D printing projects.