Hello, is impossible to select "No roof" on selected area to mining.
Areas with thick rock roof cannot be no roofed
Yeah... but it doesn't work every time. My first roof (build from walls) was removable but this here (mining) isn't:
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It might be that thin rock roofs also cannot be no roofed? I'm afraid I'm not entirely sure on this, is it just the rock roofs that are blocking your no roof zones?