A mobius design is a flat strip that has a 180 degree twist and both
ends are connected. Start a line drawn on the surface and continue
all the way around and there is no inside or outside.
Go to http://www.ganoksin.com/gnkurl/d5 and see examples, I used to
make models and cast for these people. Go down the page and see the
double mobius, I made the model for them.
A triangle shape allows you to make three 60 degree twists which
gives you the 180 degrees that makes it a mobius strip.
Doing a concentric circle with an even twist the entire length is
very difficult. I assume that cad cad could do this design precisely.
Richard Hart G.G.
Denver, Co.