Step 1) Create a rectangle and dimension to 30 by 50 as shown

Step 2)  Create your first extrude . Use 30 mm as shown in the video below:

Step 3)  Let’s make  it a shell :

Step 4)  Now let’s try something different. Delete the shell and delete the extrude, then delete the sketch the start all over.

Step 5) Draw a circle and a line. Don’t worry to much about the dimensions. Just make it look close to this :

Step 6)   Create a revolve using the line as the axis as shown in this video:

Step 7) Mess around with the 3-d shapes and do something else…make another revolve..or another extrude or one of the others. Submit a screenshot of this below the do now