1.5" 40mm PVC Pipe Cannon Shell

Fun Fact: a standard ping-pong ball fits perfectly into a 1.5 inch PVC pipe. It must be a fairly new ping-pong ball, since the old standard was 38mm but the new standard is 40mm.

With this knowledge, some friends and I made a few ping-pong ball cannons. Just print or machine (I machined out of Delrin on a lathe) a plug for a 1.5" PVC pipe with a hole just big enough to fit the nozzle of your click-button igniting torch. Place screw a few inches down from the torch nozzle to prevent projectile