Step 1: 1. Materials
-Soda can (Doesn't matter what brand, as long as it's aluminum.)
-Optional: Aluminum tape (Not pictured)
-Dremel OR X-acto (or similar)
-Dremel cutting wheel attachment
-Needle nose pliers
Step 2: 2. Cut the Top Half
Choose a measurement to be used throughout your build. We used 3.5 cm. Draw a line around your can. This is the cut line.
Cut along this line as neatly as possible using your Dremel or knife.
Using a knife (a Dremel would be hard to use here), cut out the top of the can around the inside.
EDIT: According to SpinWard, you can also use a can-opener to cut it out (Which would be smoother). Thanks!
End result of entire step 2.
Step 3: 3. The Bottom Half
Demonstrating how to set up the blade by clamping the blade in the vise.
Cut around the line you drew by rotating the can around the blade.
Result of Picture 3.
Crimp the edge of the can by grabbing the edge of the can with your pliers and twist every 1/2 inch of so.
Result of entire step 3.