This easy device will calculate the volume of any simple object. It's very easy to build, and lots of fun to use. If you like this, please vote. I could really use the prizes for my workshop. :)
Step 1: Building
Add 4 black and 2 blue connectors to an L-bracket. (Pictured at bottom) Then insert one black connector into the middle of a 3-holed bracket. Connect the brackets as shown. Connect the cable from the motor to port C. The other nescessary additions are shown as notes on the picture.