Files for CPVC and PETG spacers are online, free for anyone to use. In addition, for the fun of it, I also made drop-in barrels that will friction fit within the existing support structure. That way, you can have a 12-shot Rotofury replacement if you so desire. Not that you really should, but you have the option. Eventually, I want to get around to modeling the rest of the cylinder so that you can swap them out for maximum silliness.