r/nerfhomemades

Introducing — Project: Incident System

I’m a high school STEM teacher, and every summer I try to challenge myself with a CAD project to keep my skills sharp. Usually, that means building some kind of robot. This year, though, I took my inspiration in a slightly different direction.

Using electronic components left over from previous projects—and a whole lot of 3D printing—I built my very first NERF blaster.

Project: Incident System is a dual-flywheel dart launcher powered by high-speed RC hobby components and an Arduino Nano microcontroller.

Specs:

• Overall dimensions: approximately 12" × 11" × 5", including battery and short clip
• Weight: approximately 4 lbs, including battery and clip
• Tested effective range: 80 feet
• Approximate muzzle velocity: 100 FPS
• Rate of fire (Auto): 2.5 darts/second

Features:

• Removable dart clips
• Semi/Auto selector switch with LED indicator
• Turbo Speed selector switch with LED indicator
• REV-Up selector switch with LED indicator -This Keeps the flywheels from spinning all the way down for improved first-dart accuracy

I’m still tweaking the barrel geometry and rifling dimensions, so there’s definitely more testing to do. And I can't seem to quite get the ten dart clip to feed properly.

Unfortunately, robot season is starting soon, which means my free time to continue playing with this project is about to disappear.

I’ve uploaded the .STEP files, Arduino code, and other assorted project files to a Google Drive folder for anyone who wants to pick up the research and see where they can take it. Yes, I used ChatGPT to make the wiring diagram, please don't judge me. It's all just for reference, anyway.

https://drive.google.com/drive/folders/1o9cvH9v0RKjM74CVeOtgG0qD1jlcB_Wm?usp=sharing

Have fun, be safe!

Why yes, this is a Nerf Jolt in 2026. BUT it has a Pistol Slide, Plunger Tube Spacer, Upgraded Spring, and Priming Handle.

I wonder if it needs more modding...
(Also, if anyone wants a link to the files I have them, all except the spacer.)

Made out of a zombie bow(I don’t know the brand)
It was ugly broken and obviously without the missiles not even the exact barrel for that indeed but I grab son mdf sheets and a knife and I made this after A lot of cutting. The golden barrel is printed and can be multiple ammo(mega, rivals , triple , even the missiles but i didn’t print that one)

I've been designing this bolt action 3d printed blaster, but it just doesn't shoot very fast. Any tips on how to get it to ~ 140 FPS with a reasonable spring? The seal is already pretty good. 550mm barrel. I'm not using proper half darts, just waffleheads I cut down, but I don't think that's the issue. Front end obviously not finished.

Just finished my lynx 2.1 build. My very first build! Running a vorpal 45cm 12.75 id barrel. The SF-X3 spring. Im hoping to achieve around 250fps. The bcar adapter i made since the 45cm barrel doesnt really stick out far enough to fully fit the gfz 3x5. Going to Chrono it tomorrow as I literally just finished it.

Broke my personal best today, 454 fps!

Taloburn has put up the fight and beat xtrudex's 421 fps.

I replaced the 37mm plunger tube with a 34id plunger tube,

Made a new 11mm id straight pusher,

A 600mm long barrel, 12.6mm id which has a barrel "pocket" (breach) with oring.

Polished the internals.

Think ill be stopping at this fps level now as, the worker 1g bamboo darts are starting to suffer after one shot...

This thing is absurd and I love it lol. MIG, cut down mega, muzzle allows single MXL dart

My latest build, the Xtrudex. Based losely on the chinese designed Longbow bolt action, i modified it to be a long draw pump action instead. Built for power with a 180mm draw, 33mm id plunger tube and a 300mm 2.0mm spring. Its broken my taloburns record and is currently my personal best at 421fps! Lots of work paid off today when testing..

Oh i finally made one look more toyish and nerfy and its the most powerful one i have, lol, its a bit ironic??

Also, my new larger screen fps meter, built abit stronger and now has scroll button for stats. I can program more into it but all you really need is avg, last and best dart.

When I first laid eyes on the Hammerhead, I knew this was a blaster I wanted to build. As a pistol blaster enthusiast, it had all of my favorite features: a hammer prime, the ability to split open and swap out cylinders, and even the ability to shoot full length or half length darts. Not to mention, it’s a looker, too!

So I was happy to fork over the $7 to Bruce Leedle with Leedle Dynamics to purchase the 3D print files. As an aside, this is also the first blaster that I’ve printed on my new Bambu Labs H2C, so I opted to play with the blaster’s color scheme to take advantage of my H2C’s color swapping abilities.

I’ve enclosed pictures of the results, along with some pictures of the build process and how it looks next to other popular pistol blasters.

In addition, here’s some of my initial thoughts about it:

Positives
- The hammerhead is a very low cost build, and it requires very little hardware: no screws, no springs, no tubing, barrels, etc. All you need is some 4 mm elastic bungee chord, and you can choose between using o-rings or TPU for the rest.
- Easy to build
- Different build options: O-rings. TPU, bungee chord, springs, etc.
- The blaster looks aesthetically awesome!
- Shoots full or half length darts
- Swappable cylinders

Issues/Could be Better
- The plunger rod seems to be the weakest part. Mine broke after a few shots, which required a full disassembly of the backend to fix. I recommended printing this part with 6 walls and 100% infill instead of the 20% infill mentioned in the instructions.
- The hammer can require a lot of force to prime if you use the two recommended loops of elastic bungee chord.
- Taking apart the back end of the blaster once assembled to trouble shoot issues is a bit of a pain.
- The revolver cylinder can take some breaking in or other fine-tuning to rotate properly.
- The “actuator” and “rotor” are also potential weak points. My actuator quickly wore out, which prevented the revolver cylinder from turning properly. If OutofDarts or other blaster retailers offered a metal C&C version of this part, it would probably go a long way for ensuring the blaster’s reliability and functionality.
- There is a little gap in the frame by the hammer (see picture) that I can’t seem to close, even with all the pins/screws in place.

Link to print files. (A $7 fee applies):
https://www.printables.com/model/1789686-hammerhead-hammer-prime-break-open-revolver-dart-b

Disclaimer: I am not getting paid to promote this blaster. I’m just an enthusiast who enjoys the hobby.

Earlier I had promised that I would upload the mods I made to get the Preacher ( a Remix of the breacher to cycle Properly). Basically these mods increase the size of the roller to 25mm ( which holds the lifter up) and shave of 2mm of material from the bolt face to avoid a clash.

let me know if this helps get any of your blasters cycling.

P.S. The pump on the breacher still needs a bit of dremelling to clear a clash, so if your blaster still isnt behaving take a look at your pump clearance.

https://makerworld.com/en/models/3151662-preacher-nerf-lifter-modification#profileId-3560198

So, 45mmx2mm aluminim tube, elongated barrel and spring 26mm by 2.5mm is on its way to me.

Compared to first longshot, i didn't need to cut the plastic ribs out of shell to make blaster close.

Please, I need a file containing a 3D model of this broken piece.