Domed endcap for polygonal cylinder

So I have an object in my current model that’s an irregularly hexagonal cylinder - think a triangle with the three corners truncated to different lengths. I want to give it a smoothly curved dome endcap. Any suggestions on how to accomplish this?

Do you mean something like this?

That does look pretty close to what I want, yes.

I extrude the shape through a dome and intersected the two.

Hrm. When I try that it does not maintain a face on the curved portion after deleting the stuff in front of it.

Here is how I do it.
Is your model very small?

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I’m building a game piece to be 3d printed, yes. On the intended scale the part in question is about 4mm across.

The first problem I found is that the plugin I was using to create the dome left it as a Group. If I explode that before intersecting it works a bit better but I still get a lot of triangulation errors along the edges, places where it just … drops pieces out of the surface. I can go in and correct it manually but it’s a bit of a pain.

What type of dome? You shouldn’t need a plugin for a “smoothly curved dome”.

Is it possible that your dome has too many polygons?

Work at a larger scale to avoid the holes.

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