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

1. Adjust the proportions of the second cylinder to ensure it is 1/8th the height and 1/4th the diameter of the main cylinder. This is currently unclear and needs to be confirmed.

2. Similarly, adjust the proportions of the third cylinder to ensure it is twice the height and 1/2 the diameter of the second cylinder. This is also currently unclear and needs to be confirmed.