Re: Subtract a tube from a wall
Create a tube that is longer than the wall thickness and the circular size you want. Move the tube to intersect and go thru the wall.
Select Wall first.
Then shift-select the Tube.
Goto Object menus-
Goto to Boolean
Select "Subtract"
This should make a perfect hole in the wall. It will create triangular sections on the wall allow for the cutout sections- these will still be grouped with the wall.
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