Looks like the tiles assigned to the second extruder are not touching the build plate.
You could try adjusting the Z axis down maybe by .1mm at a time until you get proper brim around everything.
Go back into Blender and verify that both sets of tiles are perfectly aligned at their bases on the Z-Axis and adjust if otherwise. Also make sure they are perfectly flat. If you have even the smallest protrusion on the bottom, Cura will use that as the part to touch the build plate.Edited by Guest
Hello? Is this thing on?
Some more testing. Thinking the problem could be one of the STL files I tried several combinations and all of them still showed the same problem. I can load one STL twice, turn one 90 degrees to fill the chess board pattern and it still draws the skirt as if the second model isn't there. I can set both models to the second extruder and it still does it. Set both models to the first extruder, same thing.
I'd upload the STLs for someone to try but I don't see a file attachment feature.
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