Banate CAD saddle

I need a funky saddle table.

This thing is the first 'solid' generated from Banate CAD directly, without the help of any other tools. I can at least open the .stl in GLCPlayer.

At the moment, I don't export normals so if your viewer can't deal with that, it will fail. Of course, things can only improve from here.

I generated this using a Bezier surface description:

local lshape3 = shape_bicubicsurface.new({
M=cubic_bezier_M(),
UMult=1,
Mesh = mesh,
Thickness = thicknes