rack and pinion gears
thingiverse
A key component is the spur pinion gear, paired with a rack.
Download Model from thingiverse
With this file you will be able to print rack and pinion gears with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on rack and pinion gears.