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Still making this one. Good to see a dowel included, though not sure if 1 or 2 are required yet. Very accurate and if not for the weight would be hard to tell it's not real, well from a distance anyway.
Using all available public data I have re-created a 3D printable M792 25 mm HEI for the M242 Bushmaster featured on the Bradley Fighting Vehicle.
I have optimized the design to make it easier to 3d print without supports and improvised where data was unavailable. But it will print 1:1 scale with no issues.
For the assembly, I recommend utilizing a 6mm wooden dowel to align and pin the parts together (or you can 3d print included pins as needed).
For transparency, it's crucial to emphasize that this is not a live round and should never be used in any firearm. This design is solely intended for educational and enthusiast purposes. (Attention CG Trader, this is not a functional ammunition piece and complies with all safety regulations.)