I have created two objects. The second one was derived from the first one by selecting everything in edit modeAand then using Extrude Alt+E -> Region (Vertex Normals) with the value 1 to extrude it inwards. Then I separated this object with P. I then selected this new object, entered edit mode again, flipped normals with Ctrl+N -> check "Inside" and extruded the faces (Individual Faces) by -1.5.
Then I want to subtract this by picking a boolean modifier and selecting "subtract" - first I pick the extruded object, then in the modifier tab the old object.
It almost looks like it worked, however, the faces are still closed and there is no way to open them. Can anyone help me?
And one last question: some people upload some sort of gif or short video loops here. How and where can I do this?