June 9, 2003 at 12:00 pm /
Just thought of a better way….
Take a cylinder (8 sided)
remove one edge (see picture)
copy the new shape 3 times and join them together
weld the near edges together
remove the inner faces (we don’t need them)
add triangle to the inner top hole
select all the top faces (or join tham all into one face)
extrude
shift the top face (I used 10 deg.)
repeat the above two steps