Close the top and bottom of hollow object

Hi, how do you “add”/“close” the top and bottom surfaces of a hollow object. For example this cylinder.

try the CAP command if the ends are closed/planar.

Thanks! It works on the cylinder but not on my other object. Any idea?

try ENAKED to show naked edges.

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could only see Naked vertices in the commands

Join and then cap?

can’t seem to get it to work…
so my closed geometry is a combination of curves. I can’t get this shape to form a planar surface for some reason

flatten the input C of Join otherwise you still end up with multiple curves. Looks like you’re missing some essential basics of gh, I highly recommend you to go through the gh 101 docs

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3. Attach minimal versions of all the relevant files

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That worked, thank you!!

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