How can I patch the end of a solid?

[Test.1.01.cer.2002]

I created this solid in AutoCAD 2017.

How can I make the end curved like this?

To do this, I converted the solid to surfaces, then used the patch command to fill in the end. Using the sculpt command did not work because it said there were no watertight volumes detected. I narrowed down the leak to the end that I created. I eventually isolated just the patched surface. When using the sculpt command with the patched surface and a plane that clearly created a watertight volume, the sculpt command still said there were no watertight volumes detected. I tried this with several other patched surfaces but none created a watertight volume.

How can I turn surfaces into a solid using a patched surface? Alternatively, How can I make the end of the of the solid into a curved surface?

Thank you to anyone who can help,

Charles Reedy

[WarrenGeissler]

I've been playing with this and I think using the surface patch yields the smoothest output (I tried fillet but it still left a sharp edge I couldn't delete).

After creating your surfaces, you can use THICKEN with a negative offset to get them back to solids.

[Test.1.01.cer.2002]

I tried your suggestion. The surface is both curved and sharpens to a point. when I try to thicken it outwards, it creates a solid at a specified thickness (which makes sense.) when going the opposite direction, it says that it self intersects itself. How did you get this to work when you recreated the model?

I attached the model I am working with.

[WarrenGeissler]

My model wasn't like yours, so it thickened differently. I think you are limited to thickening it out. (Unless someone else here has a better solution?)