It seems that Cura 3 (and prevous versions) can't handle larger models with UM3. It simply does not fit.
I have disabled one of the extruders, changed brim/skirt/raft to none and so on.
Problem is that Cura can't place and slice a model of size 200x200x10 (x,y,z).
It works if I change the size of the model to 185x185x10.
It did not work with 195x195x10.
I have tried other versions of Cura and tried other computers with fresh Cura installations, same problem. Stl file is flawless, it is just a slab, nothing more than that.
The specification for the UM3 says:
Left or right nozzle:
215 x 215 x 200 mm
(8.5 x 8.5 x 7.9 inches)
197 x 215 x 200 mm
(7.8 x 8.5 x 7.9 inches)
What is going on here? I really need to be able to print larger models.