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

1. Change the shape of the object to be "U"-shaped. This means the object should have an open end instead of being a continuous loop.
2. Ensure that the smaller rectangle is connected to the top edge of the larger rectangle. This means adjusting the position of the smaller rectangle so that it is not fully enclosed within the larger rectangle. 

Please note that the proportionate size of the smaller rectangle relative to the larger rectangle is unclear. If possible, adjust the size of the smaller rectangle so that its larger side is approximately 2/3rd the size of the larger side of the original rectangle.