I was tired of recalibrating both Z Axeses, so i connectet them with a Ribbon and pulleys.
You have to disconnect one Motor!
Additional Parts needed:
1 Ribbon GT2 Loop 810mm 405 Tooth
2 Bearings: 8x20x7mm (inner Diameter, oter Diameter, hight)
2 Pulleys: 30 Tooth, GT2, Bore: 8mm, Hight: 6mm
Ribbon fits perectly in my Case, you may need a Tensioner.