Hi Rudy, what you need to do for extrude is to draw just one profile shape. You've actually got a bit too much drawn there.
So instead of this:
what you really need is this:
That's just the front flat part - this is what you can then extrude straight out to make your brick:
So when you want to use some of those construction tools like extrude or revolve, you want to try to identify sort of one profile shape more than the entire wireframe of the object.
Another thing to be careful of is to make sure that the pieces of your profile have exactly matching endpoints. If there are any little holes or gaps between different segments it will prevent you from making a fully closed solid. I noticed you had a small gap in your original curves, to do my extrude I erased everything except for the 2 curved pieces in the front plane and then drew 2 new lines to connect them, making sure to snap the endpoints of the lines right on to the ends of the curved pieces. To do the snapping, make sure that the "Object Snap" in the bottom toolbar is highlighted in orange, that means that it is enabled.
Then shelling should work quite well on a simple shape like this. I'm not sure where you want the opening to be, but here is an example - first I selected the top face of the brick by doing 2 clicks on it, one click to select the entire brick, and then the second click "drilled-in" to select just the top face, that should look like this:
Then running Construct / Offset / Shell with a thickness of 1.0 gives this result:
Let me know if you need any more details on any of these steps!
- Michael
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