Need Help Adding Back to Keychain

[Anonymous]

I found a keychain I'd like to use in STL format but I need to add a back to because as it stands the 3d printed emblem that I'd like to snap into the center keeps falling out. I've imported the STL and converted the mesh to BRep but not sure where to go from here. I've tried to use the offset and face tools without success. I've attached the STL for reference. Any help is greatly appreciated!

[etfrench]

In the Surface workspace use the Patch command then Thicken to fill it in.

[TheCADWhisperer · Accepted solution]

For geometry that simple - I think I would remodel from scratch.

I think you will be happier with the quality of the results.