How to convert openbrep to closed brep

Grasshopper
1

A portion of extrusion resulted in open breps.I want to use these breps for solid difference but grasshopper doesnt yield any difference with open breps.How can ı turn these open breps to closed breps.

2

Cap might do it.

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3

thanks.I tried cap but it says object refference is not set to an instance of an object.How can ı solve this?
and below is the open brep part of the extrusion. What would you suggest if cap holes doesnt work?

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image1154×866 365 KB

4

clean tree might remove the first error.

Does CAP work if you bake the objects first? i believe it only works on planar holes, fyi

6

Am I right to assume this is a QR code extruded from 2d squares? I would suggest solving these issues in 2d first. Try region union (curveboolean in rhino). Since your cubes have many coplanar faces, simplifying as much as possible upstream will give you a better chance of success at the 3d solid difference stage.