37mm Payload Cup 1.350"OD/1"ID for 3" Shell Flare Launcher Round

thingiverse

WARNING! These 3D printed models are not suitable for real-world use as is. They may be okay with non-igniting payloads, but paired with igniting payloads they would be unsafe due to the tendency of the models to break apart near the base. A better option would be using these printed models to make a mold and then casting the models using a more suitable material. Remember to keep your hands off the chamber area/barrel when firing 37mm flare launchers and stay safe with your loads! Use these designs at your own risk. I accept zero responsibility for their use or misuse. 3D printed materials tend to be weak, making it potentially dangerous to actually use 3D printed parts in this manner. Making molds and castings based on these prints may be a better option. Use at your own discretion. These are only here to help people in the hobby. It may be best to just use cardboard tubes available and a bit of hot glue to affix one of these end caps to the top for looks, such as the hollow or flat. This is intended as a printable payload cup designed for 3" shells for 37mm flare launchers. They are intended as non-firearm parts for a 37mm flare launcher, intended payloads would be making fireworks using flying fish or crackling fuse, smoke with proper vent holes drilled by end user, or OC containers. Please observe and follow all local and federal laws regarding 37mm reloading. Remember you are not allowed to create any anti-personnel rounds without first registering your launcher as a destructive device so be careful with your combination of printed parts/payloads chosen. I suggest registering your 37mm as a DD if you intend to be reloading any unique projectiles just so you won't have to worry about it. I am unsure how actually printing and using some of the end caps could be viewed legally though they are very similar to those commercially available. Stay within the boundaries of the law. The OD of the cup is 1.350" and the ID is 1". It was designed to be used with rubber bands wrapped around the base and where it contacts top of shell to stabilize it or tape may be used. Just make sure its not tighter than a slip fit, you don't want any chance of it getting stuck in the hull. If using a burst charge for pyrotechnic loads, make sure there is plenty of time for fuse and that the empty space between bottom of payload cup and burst cup is filled with glue or somehow completely isolated from the lift charge, you do not want the lift charge to set off the burst charge accidentally if something fails. In other words if it is unsafe to go off in your barrel it is probably unsafe to load in these payload cups. Making molds of these and casting is a much better idea than using a straight out of the box 3D printed parts. Remember to test with a non-igniting payload first! Fit on these can be adjusted with some tape or rubber bands near the base but be sure not to make your projectile too tight in the shell. You may also print the parts at a larger scale to be closer to a slip fit for your chosen application. Please consider tipping if you like this file so I can devote more time to designing similar models!