Good Day Steemians!
It's my first time to create 3d object using AutoCad. I search for 3d samples in Google.
I include the commands that i used in drawing my 3d object.
Step1: I draw the 2d of my desire 3d object using line command (type>line) then hit enter and type the distance needed.
Step 2: Use the circle command (type circle) hit enter. If you want to draw the circle in the middle of the line (type mid) hit enter (type mid) after you type the circle command.
Step 3: Use the trim command to delete the other half of the circle.
Step 4: In order to use the extrude command you need to convert the 2d lines you draw by using join command.
Step 5: Use extrude command, select the object you want to extrude.
Step 6: Subtract the inner circle to your drawing by using the command subtract.
Step 7: To view your 3d object (type shade) hit enter.
Thats how I did the 3d object.