2. How to Build - A Can Pipe Step 1:Materials Only two items are necessary to build a can pipe; a can and a sharp object. Step 2:Crush it Turn the can so that the opening is toward the ground. Then push in the top of the can to create a dent that will eventually keep the weed from rolling off the can. Step 3:Poke it Poke a few small holes in the center of the dent you created. These holes will be used just like a Screen in your pipe. Make sure not to make the holes too big or else the weed will be sucked into the can. Step 4:Carb it Make a round hole in the side of the can to be used as a carb. The hole should be big enough to make a difference, but small enough to be covered easily by your thumb while smoking. Step 5:Spark it Place the weed onto the "screen" of your can pipe. Then while holding the carb with your thumb, light the weed and suck through the opening of the can. When you feel that your lungs are getting full of smoke, release the carb. Step 6:Trash it Dispose of the evidence.