A while back, someone asked me for a good way to plot a Klein Bottle in Maple. I didn't have a good answer at the time, but I recently stumbled upon the following, which does a pretty good job if you don't mind the use of Heaviside in the parameterization.
'scaling'='constrained', 'shading'='zhue', 'style'='wireframeopaque');
I share it here so perhaps whomever it was that asked me about this can now find this answer via Google.
Challenge: big kudos to anyone who can make a flythrough animation with this plot using the 'vewpoint' option added in Maple 13.