Based on the answers provided, here are the corrections needed for the 3D object:

1. Ensure that the squares connected to the rectangle have the same width and exactly 1/16 the length of the rectangle. This needs to be verified and adjusted if necessary.

2. Check and adjust the extrusion of the squares so that it is exactly 1/3 of the rectangle's extrusion. This needs to be confirmed and corrected if needed.