Based on the answers provided, the following corrections need to be made to the 3D object:

1. Change the base of the object from a hexagonal shape to a square shape. This will address the issue identified in the first question.
2. No changes are required regarding the extrusion of the object as it is correctly extruded in one dimension.
3. Once the base is changed to a square, ensure that the length of the extrusion is twice the length of the square's side. This will make the answer to the third question clear and affirmative.