Extrusion problem

Even though I can extrude and trim off these areas, I get left with a very mad model with a lot of naked edges and weird shapes. Why cant I just get rid of those areas and be left w a nice model?Model1.3dm (211.2 KB)

It worked OK here - either Trim or WireCut (then Mirror) from Top.

Model_PG1.3dm (200.2 KB)

Is that what you need?


It looks good Pascal but what do you mean by “mirror from Top”? and also I have that naked edge from a revolve I did, why is it there in the first place?

Well, you end up with coincident faces with WireCut and these objects- better to cut just one quad at a time: