Based on the feedback, the 3D model needs to be significantly revised. The object should be redesigned to resemble an open pipe, which means it should be a hollow cylinder. Currently, the object is made up of solid, flat pieces, which is incorrect. After creating the hollow cylinder, a sector of it should be cut out to give the impression of a pipe missing a portion. The final object should look like a pipe with a missing portion, not like separate, solid pieces.