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USA
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Posted: 4/6/2022 6:01:42 PM EDT
I see some talk about 3D printing 40mm projectiles.
I started with the basic models from Chev-Tec and have modified, modified, modified about a thousand times to try new and interesting things and to tweak and improve the design. I have tried direct impact chalk (ie shoot a hard object directly), indirect impact chalk (ie lob the projectile far downrange), as well as foam nosed "less lethal" and a few other things. I have tried a number of different methods of increasing the weight of 3D printed plastic. |
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USA
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Posted: 4/6/2022 6:07:27 PM EDT
[#1]
Have they posted the link where their STLs are available yet? I see their youtube videos but I'm not seeing anything direct. I'm familiar with AWCY and middleton, but don't see the chevtec stuff.
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USA
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Posted: 4/6/2022 7:04:55 PM EDT
[#2]
IIRC there was a contact email in the video description.
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GA, USA
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Posted: 4/6/2022 7:37:50 PM EDT
[#3]
Can you 3D print a projectile with a hole in the front that accepts a 12ga shell, with the primer facing the target? Then superglue a BB over the primer of the shell. Then the thing hits the target, BB hits the primer, 12ga shell explodes, everybody wins.
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USA
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Posted: 4/7/2022 12:34:58 AM EDT
[#4]
With 3D printing, we can make nearly anything. However there are two issues with your ask.
1. Is that even legal? 2. Consider the length of a 12ga shell vs the length of a 40mm projectile. It might fit, I'd have to measure things up but there are more practical and simpler solutions to what you are asking. Gluing a BB to the primer is pretty crude. IF I were to make such a contraption I'd design the nose cone to carry a short, blunt nail to act as a firing pin. There is no limit to what can be accomplished with 3D printing. |
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Posted: 4/7/2022 2:11:06 AM EDT
[Last Edit: FrankW134]
[#5]
Quote HistoryOriginally Posted By giantpune: Can you 3D print a projectile with a hole in the front that accepts a 12ga shell, with the primer facing the target? Then superglue a BB over the primer of the shell. Then the thing hits the target, BB hits the primer, 12ga shell explodes, everybody wins. People are using artillery Sims in the hole. https://www.ar15.com/forums/Armory/Project-Boom--2nd-test-video-posted/21-520979/?page=1&anc=bottom#bottom |
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USA
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Posted: 4/7/2022 6:32:01 PM EDT
[#6]
I read the thread. Arty sims seem expensive and persnickety. There is an easier way.
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USA
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Posted: 4/7/2022 6:36:27 PM EDT
[#7]
I did a few measurements and yep, it could be done without too much trouble.
However an unconfined 12ga shell being ignited wouldn't produce any significant shrapnel and any it did produce would go away from the target and towards the shooter .... so not the best result I can think of. If you really wanted serious downrange effects, the choice would be to use a crimped off rifle case full of a fast powder rather than a shotshell. It'd prob produce a bigger bang with shrapnel. However one suspects a serious discussion of such a contraption is prob against the law most likely against the ARFcom rules, so ......  Its not something I'd have much interest in even exploring TBH. |
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USA
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Posted: 4/13/2022 1:54:01 PM EDT
[#8]
 Test |
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Posted: 4/24/2022 6:20:31 AM EDT
[#9]
Quote HistoryOriginally Posted By SilencerMan: With 3D printing, we can make nearly anything. SNIP IF I were to make such a contraption I'd design the nose cone to carry a short, blunt nail to act as a firing pin. There is no limit to what can be accomplished with 3D printing. A point detonating (PD) fuze, with no safe/arming mechanism, is very dangerous, and as described would possibly function on launch (inside the barrel). |
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USA
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Posted: 4/25/2022 12:39:16 PM EDT
[#10]
Quote HistoryOriginally Posted By eodinert: A point detonating (PD) fuze, with no safe/arming mechanism, is very dangerous, and as described would possibly function on launch (inside the barrel). There are better, safer and more interesting options worth pursuing IMO. |
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USA
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Posted: 6/29/2022 7:59:57 PM EDT
[#11]
Are there any existing 3D files that work with the MK Ballistics shells? I see a seller on gb just listed packs of 12 new shells. Interested to pick some up, but not sure if they'll work with anything yet.
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USA
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Posted: 3/23/2023 8:35:24 PM EDT
[#12]
Quote HistoryOriginally Posted By SilencerMan: Yes, which is why I haven't bothered to try it. Such a mechanism would also require a near head on collision with the target, which cannot be guaranteed, so I suspect the failure rate would be pretty high. In the end it would be too dangerous and too prone to failure to make it worth pursuing. There are better, safer and more interesting options worth pursuing IMO. Sent IM |
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Posted: 3/23/2023 9:03:27 PM EDT
[Last Edit: ALASKANFIRE]
[#13]
Quote HistoryOriginally Posted By eodinert: A point detonating (PD) fuze, with no safe/arming mechanism, is very dangerous, and as described would possibly function on launch (inside the barrel). Quote HistoryOriginally Posted By eodinert: Originally Posted By SilencerMan: With 3D printing, we can make nearly anything. SNIP IF I were to make such a contraption I'd design the nose cone to carry a short, blunt nail to act as a firing pin. There is no limit to what can be accomplished with 3D printing. A point detonating (PD) fuze, with no safe/arming mechanism, is very dangerous, and as described would possibly function on launch (inside the barrel). I would never suggest that it's safe because it's way out of my lane but there was commercial ammo sold that had a primer and powder in the hollow point. Old school gun stuff was crazy. https://www.ar15.com/forums/general/-/5-1061339/ http://www.thegunmag.com/explode-expand-devastate-exaggerate-pursuit-better-bullets/ |
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Posted: 3/24/2023 1:44:01 PM EDT
[#14]
Anyone had much luck with getting STLs from ChevTac recently? I have tried emailing a few times and haven't had any response back.
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OH, USA
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Posted: 3/24/2023 11:07:19 PM EDT
[#15]
Quote HistoryOriginally Posted By Extrabonez: Anyone had much luck with getting STLs from ChevTac recently? I have tried emailing a few times and haven't had any response back. I really apologize that I've missed your emails. I've been super busy with a new baby and trying to spend any extra time to work on some exciting new projects (including a new point detonation round with a safety fuze). Send me an email one more time and include your username. I'll keep an eye out for it. [email protected] |
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Posted: 3/25/2023 6:42:51 PM EDT
[#16]
Quote HistoryOriginally Posted By SGT-Fish: I really apologize that I've missed your emails. I've been super busy with a new baby and trying to spend any extra time to work on some exciting new projects (including a new point detonation round with a safety fuze). Send me an email one more time and include your username. I'll keep an eye out for it. [email protected] No problem, I know how life gets in the way. I sent you an email, and I appreciate the response here. |
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OH, USA
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Posted: 3/28/2023 9:58:45 AM EDT
[#17]
Quote HistoryOriginally Posted By bugapeno: Are there any existing 3D files that work with the MK Ballistics shells? I see a seller on gb just listed packs of 12 new shells. Interested to pick some up, but not sure if they'll work with anything yet. Those short shells should work with almost all of my printed projectiles. They may be a little tight though. You can sand them to fit or resize the base in tinkercad. I've been meaning to pick up some of those to do some load development. And the green ones would look sick with the new rounds I'm working on |
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USA
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Posted: 3/28/2023 12:48:32 PM EDT
[#18]
Quote HistoryOriginally Posted By SGT-Fish: Those short shells should work with almost all of my printed projectiles. They may be a little tight though. You can sand them to fit or resize the base in tinkercad. I've been meaning to pick up some of those to do some load development. And the green ones would look sick with the new rounds I'm working on I don't really love how they are direct to low pressure chamber venting. I'd like to see a High / Low system like the real shells. |
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TX, USA
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Posted: 8/12/2023 12:40:15 PM EDT
[#19]
Has anyone used these blanks for propellant charges? Finding the actual 38S&W blanks in stock is difficult.
https://www.perfectshotllc.com/product/38038-short-blanks-smokeless-full-load/ |
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OR, USA
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Posted: 8/12/2023 6:34:02 PM EDT
[#20]
Quote HistoryOriginally Posted By usmcagg02: Has anyone used these blanks for propellant charges? Finding the actual 38S&W blanks in stock is difficult. https://www.perfectshotllc.com/product/38038-short-blanks-smokeless-full-load/ I haven't used those specific ones, but I just got some 38spc full loads in from Boland Ordinance Supply. They are the same length as the traditional lift 38sw blank but are a little loose, so a tiny bit of RTV is needed to hold them in. But the loading creates the right trajectory and doesn't explode nylon cases. |
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WI, USA
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Posted: 8/24/2023 10:19:33 PM EDT
[Last Edit: NAM]
[#21]
Quote HistoryOriginally Posted By SGT-Fish: I really apologize that I've missed your emails. I've been super busy with a new baby and trying to spend any extra time to work on some exciting new projects (including a new point detonation round with a safety fuze). Send me an email one more time and include your username. I'll keep an eye out for it. [email protected] Sent you an email for a link; fiddled with 37mm, but time to try out some 40mm.  ETA: Received, thanks! |
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WI, USA
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Posted: 8/30/2023 8:20:52 AM EDT
[#22]
Quote HistoryOriginally Posted By SGT-Fish: exciting new projects (including a new point detonation round with a safety fuze) Any updates on this?  |
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OH, USA
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Posted: 8/30/2023 12:26:43 PM EDT
[#23]
Quote HistoryOriginally Posted By NAM: Any updates on this? Starting to work on it again after a bit of a hiatus. Also have someone else doing testing and development on it. Hopefully I'll have some updates in the coming weeks. |
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WI, USA
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Posted: 8/30/2023 1:54:47 PM EDT
[#24]
Quote HistoryOriginally Posted By SGT-Fish: Starting to work on it again after a bit of a hiatus. Also have someone else doing testing and development on it. Hopefully I'll have some updates in the coming weeks. Awesome, thanks for the info! |
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WI, USA
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Posted: 9/12/2023 8:55:08 AM EDT
[Last Edit: NAM]
[#25]
Finally got my printer up and running again. Time to start printing some ammo while I'm waiting for my Form 1 to come back.
 ETA: What are you guys using for infill on most of your items? For 37mm chalk, around 50% was good. Any less would blow through. Same for 40mm? Printing Smoke V8 for point detonating M183. |
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OR, USA
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Posted: 9/14/2023 2:47:06 PM EDT
[#26]
Quote HistoryOriginally Posted By NAM: Finally got my printer up and running again. Time to start printing some ammo while I'm waiting for my Form 1 to come back. ETA: What are you guys using for infill on most of your items? For 37mm chalk, around 50% was good. Any less would blow through. Same for 40mm? Printing Smoke V8 for point detonating M183. Ive just been doing 100% |
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WI, USA
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Posted: 9/14/2023 9:47:57 PM EDT
[#27]
Quote HistoryOriginally Posted By homemadeammo42: Ive just been doing 100% I thought I came back and edited my post; looks like 100% is the way. Printed out a nipple round, but it came out funky. Switched to BOOMv6, and it came out perfect. |
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TX, USA
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Posted: 9/14/2023 10:33:16 PM EDT
[#28]
Quote HistoryOriginally Posted By NAM: Finally got my printer up and running again. Time to start printing some ammo while I'm waiting for my Form 1 to come back. ETA: What are you guys using for infill on most of your items? For 37mm chalk, around 50% was good. Any less would blow through. Same for 40mm? Printing Smoke V8 for point detonating M183. Even for chalk nose cones? Seems like having them at a lower infill so they can break on impact would be good. |
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OH, USA
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Posted: 9/15/2023 8:07:55 AM EDT
[#29]
Quote HistoryOriginally Posted By usmcagg02: Even for chalk nose cones? Seems like having them at a lower infill so they can break on impact would be good. Those are so thin it doesn't really matter. It's basically a shell with very little space for infill. |
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OR, USA
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Posted: 9/15/2023 1:56:48 PM EDT
[#30]
Quote HistoryOriginally Posted By usmcagg02: Even for chalk nose cones? Seems like having them at a lower infill so they can break on impact would be good. Ive never not had one break on impact. Granted I shoot at a rock quarry. |
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WI, USA
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Posted: 10/2/2023 3:15:48 PM EDT
[#31]
Finally got my ABS settings dialed in for chalk nosecones. Now to get pushers sorted out. I've used lead slugs in place of washers to add some weight. Looking for an off the shelf option; going to try 3/4x10 threaded rod. Denser than washers and possibly more centered, CG wise. Drew up two modifications, one about halfway deep and one straight through.
 Just waiting to hear back from ATF. Today is one month.
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Posted: 10/4/2023 5:56:29 PM EDT
[#32]
Loving my Bambu Lab X1-Carbon printer. Figured had to do something with the 1,000 M183 impact fuzes we purchased earlier in the year.
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WI, USA
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Posted: 10/4/2023 8:50:05 PM EDT
[#33]
Nice nipplebombs! What's the detonation ratio you're getting? I have some loaded but haven't had a chance to fire any yet (waiting on paperwork). Buddy had a high dud rate using a 20ga subcal in an M203. Thinking they were tumbling and not hitting on point.
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OH, USA
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Posted: 10/4/2023 9:06:05 PM EDT
[#34]
The more glue/EPOXY the better in those rounds. Some goes for the other 14.5mm round. If the sim comes loose from firing you'll get erratic flight.
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OR, USA
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Posted: 10/5/2023 1:58:34 PM EDT
[Last Edit: homemadeammo42]
[#35]
Ive had 2 of 20 not detonate. I recovered the arty sim and they did hit nose first, so they were just duds. Still working with Chevtec on testing a boom round that doesn't need those. Hoping to get out this weekend for another test.
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Posted: 10/5/2023 4:14:50 PM EDT
[#36]
Quote HistoryOriginally Posted By NAM: Nice nipplebombs! What's the detonation ratio you're getting? I have some loaded but haven't had a chance to fire any yet (waiting on paperwork). Buddy had a high dud rate using a 20ga subcal in an M203. Thinking they were tumbling and not hitting on point. Only shot 6 so far and all worked. I'm printing out another 12 now with extra weight at the bottom to make sure they impact with enough force to detonate.  |
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OH, USA
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Posted: 10/6/2023 7:27:45 AM EDT
[#37]
Quote HistoryOriginally Posted By TreddBarton: Only shot 6 so far and all worked. I'm printing out another 12 now with extra weight at the bottom to make sure they impact with enough force to detonate. https://i.postimg.cc/zXNfsMtp/Capture.jpg Let us know how that works out. There is a fine line where too much weight will soften the launch forces too much, which will cause the setback fuze to not full activate, and makes the fuze much harder to detonate. Thats why the plastic projectiles work so much better, the lighter weight. People used to glue these 14.5s to regular pushers but got mostly duds. Then some guys made pushers out of aluminum with a lot more success, but that took a good amount of machining, I have some of their pushers and had less luck with those than the printed ones. I still want to try making these with 50 cal spotter projectile to see if they'd work at all. |
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Posted: 10/6/2023 9:13:08 AM EDT
[#38]
If you could get the trace compound to reliably ignite, that would make for some really cool projos.
On a related note, CDVS is out of the arty sims. Is there another decent source? |
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OH, USA
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Posted: 10/6/2023 3:16:10 PM EDT
[#39]
I just use glow stickers/paint for tracers when shooting with NVGs. It works pretty well.
Mutinymachine is the only source I know of with 14.5s left |
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WI, USA
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Posted: 10/7/2023 12:30:15 AM EDT
[#40]
Quote HistoryOriginally Posted By SGT-Fish: I just use glow stickers/paint for tracers when shooting with NVGs. It works pretty well. Curious if glow in the dark filament would work. Some (commercial, non military) tracers work on a similar principle. |
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Posted: 10/7/2023 8:56:11 PM EDT
[#41]
What about using something like #12 lead shot to fill a cavity in the base of the printed pusher, then epoxy over the top?
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Posted: 10/7/2023 10:07:04 PM EDT
[#42]
Quote HistoryOriginally Posted By SaturationTech: What about using something like #12 lead shot to fill a cavity in the base of the printed pusher, then epoxy over the top? Years ago, before 3D printers were a thing I was playing around with making components with silicone molds and casting them out of resin. To add weight, I did exactly that. I'd put a bunch of small lead shot in a cup and then add slow setting epoxy to it to make a gooey mix and then fill the cavities with that. |
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WI, USA
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Posted: 10/15/2023 3:02:47 PM EDT
[#43]
Anyone have luck 3d printing 40mm cases? If so, what type of filament? Single use or reusable?
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OR, USA
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Posted: 10/15/2023 4:58:22 PM EDT
[#44]
Quote HistoryOriginally Posted By NAM: Anyone have luck 3d printing 40mm cases? If so, what type of filament? Single use or reusable? I played around with it. Generally one-time use, so they aren't really worth the print time investment. |
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WI, USA
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Posted: 10/17/2023 11:10:18 AM EDT
[#45]
Quote HistoryOriginally Posted By homemadeammo42: I played around with it. Generally one-time use, so they aren't really worth the print time investment. And in some cases, one time use is ok. For something used alot (chalk) .mil M212 cases make sense. For something that's likely going to be single use (i.e. OC, Smoke, etc), ~60 cents for a one time use case isn't so horrible. |
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Posted: 10/27/2023 11:32:15 PM EDT
[#46]
Quote HistoryOriginally Posted By TreddBarton: Only shot 6 so far and all worked. I'm printing out another 12 now with extra weight at the bottom to make sure they impact with enough force to detonate. https://i.postimg.cc/zXNfsMtp/Capture.jpg I want to buy some |
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