Help with 3D print

Howdy.

I am still new to doing complicated stuff in Rhino.
I usually use it for simple vector work.

I am trying to modify an open source clamp design and print it on a Bambu PS1 FDM 3D printer.

The design is a complicated mesh and I ran MesthtoNurb to hopefully help me work with it.

I want to remove the 2 holes as shown in the attached jpg (where the yellow arrows are pointing to).

I want the piece to have fill where those holes were.

I am then going to add a flat area on the top of the clamp that is 1.635" wide and 2 screw holes.

Attached is the STL file for the clamp.

Mini - Frame.stl (626.1 KB)

How do I remove the 2 holes for starters?

THANKS SO MUCH.

You can achieve it with ExtractMeshPart + FillMeshHoles, and FYI.

amazing. Thanks so much