How to make a through hole using inward extrusion in Blender 2.8? I am trying to make a through hole using inward extrusion.
I enterd into edit mode, then I drawed an outline of my hole using knife tool.
then I turn into wireframe shading, rotate my view an select snap to faces and then extrude the hole outline inward

so the hole is created successfully, but I still have a face at the hole bottom.
I can select this face separately

But If I try to delete it, I siply delete this face (I can't select it anymore after deleteting), but I do not see through hole, so the basic cube face is still here.
So how to remove the hole bottom?
You can use the faces of a mesh to dig a hole in the same mesh, using the ctrlF &gt; Intersect (Boolean) tool. Just push the face a bit further down. Then in the Operator box choose Difference and Solver &gt; Fast.

Or use a second mesh: