Micro Cannon

thingiverse

I upgraded the cannon by Zheng3 and decided I wanted to make some improvements. This one is slightly larger, though still has the same bore diameter. One major improvement I made was threading the breach cap and also the end of the barrel so it's easier to attach the cap. Maybe this will also make it stronger but I'm not sure. I added a couple more supports between the frames including one at the top to make it slightly more rigid, and the cannon barrel fits tighter. I also made the fuse hole exit at an angle to make it slightly easier to feed the fuse through. Attached you'll find the Openscad file in case you want to modify further as well as 3 printable files. There's a file with all parts, as well as separate files for just the two frame halves and the barrel/cap. I printed mine with the infill set to 50% on the frames but 100% on the barrel/cap, which is why I broke them up - not to mention the barrel/cap will likely wear out before the frame. I may make more improvements after some testing. I'm hoping it'll withstand a Black Cat firecracker, but we'll see. What types of firecrackers have others tried in the original? UPDATE 5/11: I've updated the cannon barrel and cap based on feedback from a user who tested the cannon (thanks @mikel0142). The threads on the barrel and cap have been reversed and I've also added some vent holes in the cap to hopefully relieve some pressure and avoid the cap threads tearing apart. If this still happens, I expect only the cap would be damaged now and could be quickly re-printed. I've also split each part into separate files so you can print just a single piece if needed. I've printed everything but haven't been able to test fire it yet - any feedback is welcome. Print Settings Printer: FlashForge Creator Pro Rafts: Doesn't Matter Supports: No Resolution: .2 mm Infill: 50%/100% Notes: barrel/cap = 100% infill (Recommend so that the barrel/cap don't explode) frame = 50% infill (feel free to experiment here) Post-Printing Assembly Place the cannon barrel between the two frame halves with the fuse hole facing upwards and fit the two halves together, some glue in each hole on the left side of the frame will help hold it together. It can be a pain to keep the barrel lined up while pressing the halves together but with a little patience you'll get it. The cap is screwed into the back of the barrel before firing.