To adjust the bed level better
Print one top and one bottom. (you may want to mirror Z for printimg)
- Dismount the top Z endstop
- mount the top with 2 M3x16 screws and 2 M3 nuts from the inside
- mount the bottom with 2 M3x20 screws from the outside (through the frame) on the switch.
- take one M3x30mm screw and any spring (eg. from a pencil) and put the top and bottom with the spring and an other nut together.
Adjust the Z-Level by turning the vertical screw cw or ccw.