Here is the liner actuator that I made for my lego mindstorms printer. A liner actuator is a device that changes the turning motion of a motor to a up and down motion. The of the range of actuator( how much it moves up and down) is about 3 and a bit holes. It’s hard to explain it so took a lot of pictures and a video:
I also plan to use this liner actuator in my next project coming in the next two weeks.