BlazerFFR_51mm

I made a large double-walled 2-inch barrel cannon similar to that laid out by "The King of Random" https://youtu.be/Zuc3Oc3r7ww
since then I have printed dozens of these 50mm FFR's at about 51.5mm scaled diameter and several lengths. I prefer them printed in TPU/Flex material because they last many many launches, I have lost one at over 250 yards at 50 PSI with a tailwind of 12 mph and I am continuing to modify them, I wanted a little more twist, and a little better stabilization in an ongoing search for further distance, and more fun.
I have printed them with a single exterior wall, and concentric infill at 15% from TPU for a very soft and spongy projectile that doesn't last more than 12 launches, but I have some that have seen more than 50 launches and are my goto, for long-range and lots of running.
Currently, I am waiting on TPU, and printing from my reserve supply (3d Solutech: Carbon Fiber reinforced PLA, with a 0.8mm nozzle, 30mm/s, 0.2mm layer height, 215C hot end, and 45C b