Curve don't keep even proportions on 90 degree angles?

[anon18318387]

Basic workflow (The answer was not specific to you for general users)

1. Make a bezier curve
   

   

2. Set the handles to vector
   

   

3. Model a mesh to extrude along the curve
   

   

4. Convert the extrusion to a curve

   

5. Set the bezier curves’ bevel object to the extrusion
   

   

6. Check fill caps
   

   

7. Set the bezier shape to 2D in the object data tab
   

   

8. Extrude corners