Uneven surface

I am making a slant solid that is thicker on one side. But I keep getting this uneven surface. I used loft to make this surface. Does anyone know how to fix this or a better way to make this?

surface.3dm (251.7 KB)

Hi Eric - is each side meant to be planar? your posted file seems not to have the input curves, so I cannot tell.


I guess you are manipulating the solid edges to get slant formed, this doesn’t work since Rhino will compensate for it by changing the surface topology.

I suggest doing it like this:

1- extrude the original surface Stright
2- create a cutting plane (by duplicating the original surface
3- Boolean Split.