Dual Head Calibration Issues.

[sds2k]

I am running a PowerSpec 3Dpro printer and I have just begun to attempt printing objects with 2 different colors at the same time. The problem that I am having is that the print heads are dragging through the already printed material and tearing up the model. I have paid close attention to leveling the heads with one another and leveling the print bed with the heads to get that paper thin gap equal on both heads but I am not making any progress with solving this issue. Each time I start a print it is not even getting past printing the raft before it starts tearing itself apart. Any suggestions on how to solve this problem?

[Mjolinor]

Do all your levelling at working temperature not while the printer is cold.

[curious aardvark]

and add an actual level build plate on top of the non-level one it shipped with :-)