I have always been under the impression that single extrusion increased / maximized the build area of the UM3. There is a profile available for the UM3 for single extrusion:
https://ultimaker.com/download/59981/MaxVolume-UM3_PLA (Single extrusion).curaprofile
Maybe this will help?
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kmanstudios 1,120
To maximize the build area turn off:
Brim
Supports
You have to take into account that the build plate area is reduced by the dual extrusion offsets.
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