Simple CO2 holder for octagonal inflator

I needed a way to carry my CO2 inflator on my bike, and none of the several great designs already available quite worked. Looked at the inflator and the hexagonal shape, and realized it could be very simple. This is about 10 minutes of design work and a 15 minute print (maybe) and it works like a champ. The inflator I have is tapered, so I just press it down into the octagon and it stays put.