About this 3D model

This adapter is to convert the Ultimaker standard bed mounting with 4 alignment screws to 3 alignment screws, allowing for easier 3-point alignment. Add this adapter and drill a 3mm hole in the middle of the two back mounting holes for the ultimaker bed. Add a spring and thats it. With this modification simply first level the print bed on the back side where there is a single screw, then adjust the front ones.