How do you extrude an open surface to a closed solid?

Rhino
1

on the left is what I’m looking into doing; extruding each surface singulary it’s messy; selecting all the surfaces, and then extruding them with the gymball doesn’t look possible; any function that might work as I want?

2

Hey have you tried ‘Offsetsrf’ and VariableOffsetSrf’?

3

offsetsrf works thanks

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