I am trying to patch the ends of a piping model after capping them with bounded plane. I plan on using space finder to get an internal volume, but I get an error message saying"Tool Sheet Edges are not close to target body or do not form a closed loop."The other end of the piping model is capped, but it isn't patched.
Try the Patch Openings command. It is more applicable in the case you described than the Patch command.