Hi Booleano,
re:
> Why can't I extrude this curve as a solid block? I've tried everything.
You need a closed planar curve to extrude as a solid, your curve isn't closed.
You can tell by looking at the object type indicator in the upper right corner of the main window, it will say "Closed crv" if it's closed, or just "Curve" if it is open.
There is a plugin here that can help you locate the open area:
https://moi3d.com/forum/index.php?webtag=MOI&msg=5288.21
It's at the bottom:
- Michael
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