Cura builds cause Z axis to try to bottom out HBP

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Hi folks,
I have acquired a D4s and am frustrated with using replicatorG as it seems capable of only dealing with single part STLs.
I have tried Cura to combine them (which is does easy) but the gcode builds cause the Z axis to go to bottom and then it continues to try to wind down even when it hits bottom. No such issues if I generate gcode with replicator G other than it fails to build about 50% of anything I attempt. And always lots of filament bursting out.

Any ideas? I'm new to 3dprinters. At the moment I'm ready to return the printer, its second hand but the previous owner couldn't get it to work consistently.

Hello, i use simplify3d to deal with dual extrusion, work good !!!