Yay, came up with a solution!
Since ReNo have this problem, several others might,
so i will tell you all how i did.
To create a torus without invalid solid structure,
do like this:
1. Create your torus
2. Press ALT+P, to open the
Check For Problems dialog
3. Click one of the milions of "invalid solid structure" errors
and click "Fix all of this Type"
4. You will notice that your torus now looks like s**t, there
are edges sticking out to the end of the map.
5. Select one of the "Unlimited pipes", they are made up of several
pieces so it can be tough reaching all of em'.
6. Now use the Clipping Tool (Shift+X) to cut away the bad parts.
Look in the
Top window, you can see what to cut away:
the part that enters the next part in the torus.
6. Note that you will have some blocks remaining when done clipping
most of the "unlimited pipes", use their positions to figure out where
to cut them.
7. Your should now be able to use your torus without errors. If you
require more toruses, simply copy your original one and rotate it into
position.
*Phew, this was almost like writing a tutorial ;D
