I will assume you want to print with extruder 1.
Load the model, it will by default be printed on extruder 1.. If you want to print support, check that the support extruder is set to 1. Then check that the brim or the skirt is also set to extruder 1.
Don't try to slice for the UM2 and then print on UM3. I'm not sure whether that works, but results will certainly not be optimal.
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ahoeben 1,852
Your caps-lock seems to be stuck
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kmanstudios 1,120
Just bring in the model and then it will print as a single extrusion by default. Just make sure you are not using supports or dual extrusion.
And, yeah, the caps lock is hard on the eyes....
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