This tutorial guides you through the simple steps to solve the problem of uneven Shell thickness in 3D Max.

1) Create a line.

2) Add an extrude modifier.

3) Add a shell modifier and enter Inner and Outer Amount.

4) You can see that the thickness created by the Shell is uneven.

5) Check the Straighten Corners property of the Shell.

6) You can see that the thickness is consistent.