GEOMETRY/DRAWING
Create two "Legs" 
Surfaces: Geometry -> Create -> Object -> Rectangle ->
Enter First and Second Corner Points -> 2,2 & 10, 0 : 2,2 & 0,10
Make sure to click "Join"
for 2,2. Otherwise these two legs are not correctly connected.
Create Line 
Surface : Geometry -> Create -> Line -> 2,0 -> 0,0 -> 0,2
Geometry -> Create -> NURB Surfaces -> Automatic
-> Number of sides 4
Create Volume 
Copy/Transform -> Translation -> 1 mm along the Z axis with
Surface Extrusion
Geometry -> Create -> Volume -> Automatic 6 sided
volumes -> Create 3 Volumes