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Posted: 5/22/2026 3:01:22 PM EDT
[Last Edit: TyrannyOfTheMinority][Edited]
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Just getting my feet wet with 40mm. Anybody have any files to print normal M212 cases? I understand there's some floating around as part of a larger file pack (projo and all), but have not seen it. Also ran across this reference on r/40_mm from Washington County Guns, maybe @TreddBarton can chime in with more info. I understand these will likely not be reusable (one shot at best), but I'm willing to put in the print time vs buying them. Or possibly print out of stronger materials than PLA to see if it helps longevity. Thanks in advance. Feel free to PM me. |
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Thanks guys, understand the machined ones are a good option. I’d still very much like to experiment with printed cases. I’ve got the capability to print in some high strength exotic materials, so I’m gonna give it a go. In the absence of a file, I’ve done up my own CAD of a M212. Printing it in a carbon fiber nylon right now - we’ll see how it comes out/holds up. I’d say conservatively, I can print about 200x nylon cases for what I’d have to pay for 15x aluminum ones. And another three times that quantity if I can develop a design that functions for PLA. So I’d say it’s worth a little tinkering… |
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Originally Posted By Heineken: Also out of stock, I'm also on the email list for him. Love the 2 part design for loading blanks as well without breaking the seal of the projectile. Totally forgot...I have two of these i was going to test out last weekend. Did some of his 3d printed wire pull smoke rounds. First one worked great. Second one got stuck in the bore from fouling....as did the 3rd and 4th. At that point, I could not even chamber rounds. That got fouled much quicker than I thought it would. |
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Nice. I'm interested in your findings. There would be a market if you can make one that can take 5-6 reloads. A lot of the printed ones I have seen use an inner metal tube, usually so something readily available at hardware stores. Are you rolling your own blanks for the charge? |
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There were a couple of guys at this year's Big Bore Blast that shot in the 40mm contest that had what looked like 3D printed shells. I did not get to talk to them though. Edit: rereading your post. Are you looking for shell designs that do not use additional hardware where the launch charge is inserted? |
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Op, yes you can print cases. They break. Google “m212 stl” and see if yeggi can find anything In the MILC file pack there is a case made with printed case heads epoxied to store bought tubing, I haven’t used those though, and that was to be used with the MILC chamber It’s all on the sea |
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Originally Posted By cmts58: Op, yes you can print cases. They break. Google "m212 stl" and see if yeggi can find anything In the MILC file pack there is a case made with printed case heads epoxied to store bought tubing, I haven't used those though, and that was to be used with the MILC chamber It's all on the sea |
The government is just a corporation with a monopoly on violence.
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Originally Posted By 243savage:. Edit: rereading your post. Are you looking for shell designs that do not use additional hardware where the launch charge is inserted? Correct, hoping to work something out that can function without My form 1 for the launcher is still pending, so I can’t test yet, unfortunately. I’ve got several materials to test already printed up. Fingers crossed. *Edited for clarity* |
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Originally Posted By TyrannyOfTheMinority: Correct, hoping to work something out that can function without any sort of insert for the launch blank. Print and go, so to speak. I'm hoping some higher strength filament might accomplish that. The hi-lo system developed for 40mm is the way it is for a reason. I don't really understand the physics behind it, I've just been copying someone else's homework. I can tell you that forgetting to install a new burst disk when you reload the cases leads to a comically under-performing shot. If you're trying to replicate the performance of the real thing, you'll probably need to replicate the design of the real thing. |
The government is just a corporation with a monopoly on violence.
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Originally Posted By Gingerbreadman: What launching blank are you planning on using? The hi-lo system developed for 40mm is the way it is for a reason. I don't really understand the physics behind it, I've just been copying someone else's homework. I can tell you that forgetting to install a new burst disk when you reload the cases leads to a comically under-performing shot. If you're trying to replicate the performance of the real thing, you'll probably need to replicate the design of the real thing. For sure, still need the burst disk! I'm only looking to replicate a M212 case using a standard launch blank with burst disk. Building out a functional true Hi/Lo case is beyond my level of understanding/capability. I'm using blanks from Bengles for the moment. He seems to put out good stuff from what I've seen and I'm happy to give a forum member my business, even if they are a little more expensive than Boland. |
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