In this tutorial, you will create this part using shell feature tools.
1.Click New. Click Part, OK.
2.Click Front Plane and click on Sketch.
3.Click Rectangle, sketch rectangular. Click Smart Dimension, dimension rectangular 3in x 3in.
4.Click Feature>Extruded Boss/Base, set D1 to 2in
and .
5.Click on front face,
and click Shell on shell Parameter, set D1 to 0.1in, check show preview and .
6. You’re done!