Printed rounds for the 9PAK signaling revolvers. https://odysee.com/@clearview4851:e/fossa-9pak-r:a
this post was submitted on 11 Nov 2025
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Reloading Ammo
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Cool stuff. I'm sure that a 209 primer alone is sufficient for these.
As far as the anvil goes for the bernand primers go, check out the 43R intermediate rounds. They have a "bar" that the anvil of a boxer primers seats against. As is, the design wouldn't work with bernand primers, but making the bar a point downwards would probably do the trick.
I, may be, wrong described the problem, sorry. English is not my primary :) The problem is not about the printed anvil broken. The anvil itself stay in place. But it's point smashed. The primer punched pretty well. Even the priming matrix is damaged. But fire not set. The plastic tip of the anvil dumps the impact impulse. Adding the steel pin do the magic. The pins could be DIY from a wire, just hard to maintain the length as precise as factory made.
BTW, the 43R family have many interesting designs which could be inherited to smaller calibers.
I see your problem now. If you are only using these for blanks, with primer only, you could probably use a more rigid material such as PETG. Although something such as PA-CF or PLA-CF might do the trick, I would avoid filled materials because they are abrasive. I have had similar thoughts about adding a steel pin for the anvil in other projects, but since I have started using the primer bar, I have had no reliability issues. This won't work for your situation though. The steel pin will be the way to go. You just have to make Sure that it stays in place so that it doesn't become a projectile and damage something.
Those 43R variants are just the initial release. There will be many, many more to come. These include precision oriented slugs, shotshell optimized for alternative payloads, signals, and magnum loads.
I also have another 3d printed caliber like 43R (chamberless smoothbore using off the shelf pipe) for small platforms called 33R. Same concept, just 33 caliber instead of 43 caliber. It hasn't been released yet. It is intended for a harlot based platform, and the smaller shells work just as well. I don't think you could reliably make ammo much smaller than a straight walled 32 caliber round, you just don't have enough material around the primer pocket.
Pretty much all of my printed ammo projects are based on Deep style printed ammo. If you want a bit more information, "The 9mm Deep" has great documentation about this ammo type. It has been out for a while and tested by quite a few people.