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I need some help with a new Monoprice 3d select plus. How do I set the home position for the z axis? Everytime I press the home button, it raises a little bit further. If I turn the printer off and level and set the bed height, then turn it back on it raises up off the bed and a half inch. If I try printing from the SD card it never locates the bed and gets started. I can’t even tell where the bottom out height is because all the home functions just keep raising the head a little bit further.