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

1. Change the shape of the object from hexagonal to rectangular. Ensure that all sides are perpendicular to each other to achieve a rectangular shape.
2. Incorporate a rectangular slot within the object. This slot should be clearly visible.
3. Position the slot at the center of the object.
4. Ensure that the depth of the slot is less than the depth of the original object.
5. The size of the slot should be approximately half the size of the original object.