i think you can't cut multi layer of roof extrusion in one go? you need to cut model in-place extrusion void per layer or edit the roof by layer to cut the void? you can isolate the roof by element (bulb icon) and then cut. thanks
Remember : without the difficult times in your LIFE, you wouldn't be who you are today. Be grateful for the good and the bad. ANGER doesn't solve anything. It builds nothing, but it can destroy everything...
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