The Senior-Year Rebuild
A working, fully mechanical webshooter: no electronics, no sensors. Just spring, string, and geometry. Rebuilt from scratch in two weeks, every single day, fully solo.
Freshman year, I built a functional Spider-Man webshooter. I had built some before high school, following YouTube tutorials using cardboard, springs, and paper. But once I got into 3D printing, I decided to redesign it from scratch in Blender: not just a prop, but a working mechanical prototype, also featuring a removable cartridge. It worked. It was built from mid-March to mid-July, working on it roughly twice a week, and it remains one of my favorite projects I've ever done.
Coming out of IB Diploma junior year, I wanted something genuinely fun to build. No rubric, no word count, just me and a printer. The timing lined up too: Spider-Man: Brand New Day comes out this summer, which made revisiting this exact project feel right.
When I went back and dug up the old freshman build, I didn't actually find many intact parts. Mostly extras, snapped pieces, and failed prints. So this rebuild started almost from nothing physical, just memory and old files.
Officially, this is “Ranbir's Spider-Man Webshooter, V2”. V2 because it's the second full official iteration of the project. Internally, each component went through its own sub-versions, but V2 marks the whole system, top to bottom.
The rebuild took 2 weeks, working on it every single day, fully solo. Design, problem-solving, and troubleshooting were all mine.
This is honestly the biggest difference between the two builds, more than any single part.
Had a vision for the entire webshooter, built the whole thing in one shot, printed the whole thing, and only then started solving problems. That made it brutally hard to fix issues buried deep in the design. By the time something broke, it was tangled up with five other systems.
Broke it down feature by feature, version by version. Each version of a part had one specific goal. I'd iterate on that version until it hit the goal, then move to the next version with the next goal.
The clearest way to see the speed-up isn't really the total time. It's the rate of work. Going from a couple of sessions a week to working on it daily is what actually let the whole redesign (five components, multiple versions each) close out in a fraction of the calendar time the original took.
That, plus genuinely being much faster in Blender and 3D modelling now, and having engineering knowledge I didn't have as a freshman (like where plastic actually needs reinforcement under spring pressure), made the difference.
Purely mechanical: no electronics, no sensors. Just spring, string, and geometry. Load it up and fire it yourself.
Effective range: about 10 feet. Not bad for a prop running off a small compression spring.
Filmed on my own wrist. Keep your eye just above it: the bullet is out in a fraction of a second, so it's easy to miss at full speed.
Each part below is shown starting from its freshman-year original, through every redesigned version to the final one.
The barrel went through the most iteration of any part, since it has to hold the entire system together.
The original 3D-printed barrel. No reinforcement built into the design, so it consistently snapped at the area where the hole for the stopper was seated.
Focused purely on getting the spring to seat right: the spring catches on an internal cylinder, while the bullet passes through a hole drilled through that same cylinder. Mostly printer-tolerance testing to get the fit right.
Added internal space for the new, thicker, more reliable stopper mechanism.
Added a magnet-based mounting system to attach the barrel to the outer casing.
Tested the new cartridge-locking system: moved the twist-lock grooves off the cartridge and onto the thick main barrel instead.
Brought everything together. Added support material and extra plastic exactly where pressure builds up under spring force, something I genuinely couldn't have known to do as a freshman. This version doesn't snap, and it's super solid.
This component didn't exist at all in the freshman build. Back then, the whole thing was just strapped to a cardboard base.
No casing at all: the printed barrel was just taped and strapped to a cardboard wrist mount.
Held small-scale barrel tests only.
Expanded to hold the complete final barrel.
Expanded again to add holes for a Velcro strap (secures it to the wrist), some aesthetic detailing, and a curve that actually matches the shape of a wrist.
Fixed a real problem. The casing has two parts, one that holds the barrel and one that secures it in place on top, connected via magnets. The thin bridge piece connecting the two sides of the top part kept snapping from the force of removing it against the magnets. Solution: removed the bridge entirely and split it into two fully separate parts, each cradling one side of the barrel independently. Also resolved an issue with the barrel sitting awkwardly in the casing around the stopper's pull-string.
Original bullet shape, with an abrupt internal opening. Snapped after a single firing.
Rounded the inside edges for better adhesion against the stopper and a less abrupt catch point. Resized to match the spring's exact compression amount.
Had the twist-lock grooves cut directly into the cartridge itself, which made it a structural weak point. Almost always snapped.
Removed the grooves from the outside of the cartridge entirely. The new version is a strong, plain cylinder with two small nubs that key into grooves cut into the barrel instead. The logic: the barrel is already big and strong, so there's no reason to weaken the cartridge when the barrel can take the structural hit instead.
Super small, with a very small rubber band system. Held less reliably.
Made bigger and beefier overall. Added the ability to hold rubber bands in place, and designed it to inject into a groove in the bullet once the bullet is inserted, then release cleanly when the string is pulled.
Everything was designed in Blender, printed on a Flashforge Adventure 3, in PLA. Since every part is interconnected, I didn't design things in total isolation. The actual workflow:
Build and iterate everything inside one master Blender file, NewWebshooterWorkspace, since changes to one part often affect another.
Once a part is finalized, copy it into its own dedicated Blender file.
Export to STL.
Pull into 3D Builder to repair the mesh. It catches irregularities before they can cause slicer bugs. Genuinely a huge time-saver.
Re-export, load into the slicer, slice.
Export the sliced file and load it onto a USB stick.
Walk it over to the printer. Print.
Everything's organized into three folders: Blender files, STL files, and sliced (gx) files. The old freshman-year Blender files live in a separate archive folder. I referenced them briefly just to understand how the old system worked, but didn't dig through all of them.
The freshman version had real, recurring failures. This version fires multiple times in a row with nothing breaking.
Every problem that plagued the original has been solved at the source. It's not a patch job. It just doesn't fail anymore.
I remember sitting down early on in this project, right after digging through what was left of the freshman build, and sketching out on a sticky note what I thought the new version should look like. Felt like a solid plan at the time. By the time I actually finished the rebuild, the real thing looked almost nothing like that sketch. Basically nothing carried over except the general idea of making it bigger and stronger. Every real decision happened later, in Blender, one version at a time.
A separate sketch, one I did of the barrel and outer casing together later into the project, went the complete opposite way. I followed it almost exactly. I still look at that piece of paper next to the final 3D print, and it's like I'd already solved the design before I ever opened Blender.
Putting the magnets in meant supergluing them into place, and the second I cracked that bottle open, the smell hit me and I was straight back in freshman year. I remember gluing my fingers together more times than I can count back then, constantly stuck trying to wrangle those magnets into place. This time, doing the literal same task, I didn't glue my fingers once. Same smell, same project, completely different hands. It really made me laugh.
I remember the first time the freshman webshooter actually fired, and it broke completely doing it. Didn't even care. I was just so happy it worked at all that watching it destroy itself in the same motion didn't bother me one bit.
This time was different. I remember pulling the string and it just fired, clean. Then I did it again. And again. Nothing cracked, nothing snapped. After two weeks of taking this thing apart piece by piece and rebuilding each one from scratch, that was the moment it actually felt done.
After two weeks of grey test prints, the final build, twice over: a matching pair in Spider-Man red and blue. One for each wrist.
I published the designs on Cults3D, so anyone with a 3D printer can build their own working webshooter. Same mechanism as everything on this page: spring, string, and geometry.
Get the files on Cults3DBeyond just being a fun build, this is proof I'm still the kid who looked at Spider-Man's webshooters and wondered how they worked, and that I can take something I saw on TV and actually build it with my own hands and my own brain.
Real results. Not just an idea I talked about. Something that actually works.
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