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.

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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