Z leveler Geeetech Pro B

I printed 2 of these out after I saw the original Prusa demo Jose did. Check it out here https://youtu.be/JqH41K2vq0g?t=9m50s To level the Z rods you just run the Z all the way to the top. When the X carriage hits the top they are both level. The Geeetech Pro B design won't allow the carriage to get all the way to the top so I made these spacers to ride along the support rod. I have checked after the leveling and I am less than 1/10th of a mm off. These slide freely on 8mm support rods.