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

1. Add two rectangular cutouts on the edges of the object. 
2. Ensure that the left cutout is three times longer than the right cutout. 
3. Verify and adjust, if necessary, the width of the object to be three times its height. Please note that this should be done while maintaining the rectangular shape and small depth of the object.