fix Z position after transformation
fix Z position after transformation

kennethjiang/OctoPrint-Slicer,DeltaMaker/OctoPrint-Slicer,DeltaMaker/OctoPrint-Slicer,kennethjiang/OctoPrint-Slicer,kennethjiang/OctoPrint-Slicer,eyal0/OctoPrint-Slicer,DeltaMaker/OctoPrint-Slicer,eyal0/OctoPrint-Slicer,eyal0/OctoPrint-Slicer