How Dangerous are 3D Printed Knives? 

Does anyone else appreciate the irony in wearing a face shield, then throwing the knifes at the ground wearing crocs

She truly is the michael reeves of 3d printing

Prison inmates have been stabbing each other with plastic shanks for years, so they're definitely effective weapons. They typically use a toothbrush that's been melted with a lighter, but the number of stabbings in prison, which is probably a majority of stabbings overall, are often done with an improvised plastic weapon. So, yeah, it's no joke--if you're motivated to put holes in someone, it's both easier and more difficult than you'd think.

Ballistic gel is one of those materials which is basically only useful as a metric for comparison. Usually tissue expansion due to the body being made mostly of water. Not quite the best for testing sharp objects. Should check Joerg Sprave's tests for sharp things!

Ballistics gel also has a tendency to grip when things pass through it so it's not really conducive to how knives or arrows actually work because flesh is slippery once penetrated which would make a knife or arrow go deeper with less force. Almost anything with a point on it can be used as a lethal weapon. If you strike at an absolutely perfect angle you can penetrate flesh with a plastic bendy straw.

Fun fact, most ceramic knife makers do put metal powder in the ceramic to have it trigger the metal detectors at airports and events….

At 3:48, I quickly saw "perfect for multiple cats" on the cardboard box with no context. This led me to believe that the selling point for the fridge (or whatever came in the box) was that its box was perfect for multiple cats to play in. So I rewound and found the context, and am now fully convinced this is the intended reading.

Face shield + crocs = peak PPE

This is interesting, funny, and kind of scary, all at the same time. Next level: a robot to pentrates the knife with repeatable force into the gel. Also, some slow motion might be cool; maybe a colab with @theslowmoguys.

Truly the peak of what a STEM major can achieve

I am absolutely amazed that no one was accidentally stabbed by a rebounding knife during filming.

I love my 3d printed pews. Always gets attention at the ranges :D

I thought this was a fun video and I loved the apron and I'm vicariously sad the amogus mold didnt work out. The ballistic gel was super cool, though, I didn't think it would be so dense. Theres a company called Black Triangle that makes pointy things out of G10 material that is used a lot in knife handles. Kind of a last ditch stabby boi vs something that will cut or slash. I'm kinda interested if YT will throttle this kind of video too like they do the pyew pyews

If that Japanese knife maker can make kitchen worthy knives out of chocolate, paper, blood, glue, or whatever, he did a lot, 3D printed knives will work better than those. The more important question is how well do they retain their edges.

This is the kind of wholesome, 3D printing centered relationship I am striving for

I mean in theory the pearl clutchers should be way more afraid of 3D printed knives, because they can be all plastic, no metal required at all. Meaning they can find their way into a lot of restricted areas...

I’m a Blacksmith and my apprentice and I like to leave random crewmate drawings around the shop for each other to find.

some of those stabbing the side of the block were making me nervous when you had your hand on top of it and only stabbing a few inches away from your hand and arm...

Prisoners make shanks out of anything, even plastic.

First time I've watched one of your videos, you all look like you had a lot of fun making it. Thanks, I found it very entertaining. 😁

Ballistic gel does not act the same with knifes as bullets, that is why it has the word ballistic in the name. The friction between the gel and the side of the knife is too high. For testing knifes a cabbage would be a better approximation to human flesh.

OK I’ve never seen this person in my life why do I love the fact that she’s going with the kitchen joke

First time seeing the channel and I loved it. The intro story was so cool and I love how it’s just y’all hanging out making this video. So tired of these channels with a whole production team and a fake personality

You can 3D print a whole lot more than just sharp pointy things nowadays. Definitely a cool video that tests some uncommon designs.

As thrilled as I was with the awesome experimentation, I must lodge a complaint that ye got me really excited for sewing at first… 😆 Those turned out excellent, and way more durable than I would’ve guessed! I wish the huge mold worked!!! The little ones were still adorable, though! (And stabbable! Ha!)

For future reference: If a blade doesn’t have a cross guard of some sort, anchor a finger or your thumb (whichever is applicable) underneath the handle when stabbing so your hand can’t slip towards the blade and slice open.

The thing about 3D printed knives.... If it's sharp and strong enough to enter the body, but brittle enough to shatter, it could do some SERIOUS damage, now in stead of a stab wound with a knife in it, you have a stab wound with multiple small sharp pieces of plastic in it! XD

I love this channel so much

British police shaking and screaming right now.

You should 3D print a gun

In tacti-cool circles we use bone in roasts. A small locally owned store will sometimes hook you up with rotten meat for free. Oh hey it's the gun psycho asking for rotten meat again.

This can't be a good idea 😂 let's see how it goes lmao

This tickles my gen-z brain lol. It’s crazy to me that y’all are only a couple years older than me, keep up the engineering!

i subcribed in the first 30 seconds, thanks for the fresh take on geeky videos

congrats on 420k subs!

I'm a new sub & I'm loving your channel great stuff keep it up

Im saving this video for my trip to england

Awesome video! I was surprised how durable they were 🤯

I saw you made a lightsaber. What did you use for the blade? Wanting to start to make one as the official ones are too pricy and then I can improve finishing techniques. Loved the throwing stars.

Just an expensive prison shank could have just sharpened the end of a toothbrush

I could sense the fear the cat was experiencing at that moment 😂.

Youre such a comedian its genius

That type of gel is mostly for measuring bullet velocity and power.

Now imagine archeologists from 4000 AFSM wondering what resin arrowheads are doing around AmongUs-shaped fossils..

This channel is underrated. She should be at least at like a mil subscribers

Neat video, cool apron:)

YOU ARE SO COOL! THANKS FOR BEING AWESOME AT OPENSAUCE! :DDDDDD

people in prison use a sharpened back end of a toothbrush as a shank, that answers "does plastic work as a knife"

First time here and... I'm definitely subbing, like right now ^^

I love that she basically just taught anyone with a 3D printer “here is how to make a weapon. Have fun!” and I love it 😂

That Among us jello is the best thing I've seen this month.

“Women in STEM” had me rolling. Glad y’all can see the humor in that ridiculous campaign.

“It wasn’t enough to tell me if the knives were dangerous or not” i’m not the only one expecting her to test on a human, right?

0:10 Emily truly is the best wifi

I have a bambu lab p1s. Cant wait to do some wholesome things with it :)

So there is a market for non Ferris self defense sharp objects. I’m super surprised there were no gloves seen at all in this video. Also you should’ve used a side of pork belly to have a better control medium.

the best intro ever... you're so funny girl, me and my brother couldn't stop laughing

i didnt even realize 8 minutes had passed. amazing video

This was so fun

You don't need to sand it more, you need finner sanding (finish like at 10000), Ive seen a guy made razor sharp knife out of a pasta on youtube, more than most chef chef knive Ive seen in the restaurants Ive worked.

"this is going to shatter" proceeds without gloves

i thought i recognized you from somewhere, i thought it was a jackpop video but then i remembered that my brain doesn't work and i would probably recognize anyone as someone from another video

Can't stop the signal!

Her humor is top notch ngl

You can make a pointy object out of anything. And it will work at least once. To for a life of crime…not great…. But for a one off….perfect. Thanks for a great video… My only problem is that You Tube did not put a subscribe button on you channel!?!?!? You might want to check into this because I would have subscribed if there had been a way to do so. PS: PLEASE Be CAREFUL when stabbing directly when using a knife. The primary injury is for the hand to slip forward onto the blade…yes…even if there is a hilt to block that from happening. I worked in an ER and this is the most common knife injury…NOT the pointy end.

The Ides of March on the Amongus was brutal.

i wouldn't be too concerned about criminals 3D printing bladed weapons, even if the blades are potentially dangerous. For several reasons. - Criminals can make dangerous weapons with a lot less, thats how prisoners have shanks. - If they have access to a 3D printer, they're likely capable of getting more potent weapons from sources outside of that 3D printer - Any attempts to regulate criminals from making bladed weapons with 3D printers would hurt normal people a million times more then it would for any criminal

Nice, niw i will get myself some anycubic sturdy resin and print myself a Medievil mace, just to one up you.

the best part of the resin printed pointy things is if you don't wash them before using them they also deal poison damage :D

😂 Loved the whole video.

The knifes in the corner 😭 0:34

Ah yes let me go down to the 3d printing store to get my dangerous 3d printed knife instead of... buying a real knife

Funny you bring up the Geneva Convention when making the Among Us mold as the game was in breach for using the red cross logo outside it's intended use

3D printing in UK bout to go through the roof

You got my sub just with this intro

5:15 "Yeet"

Please do 3D printed bullets next.

steel is way heavier than plastic so the plastic ones won't throw well. You need both sharp + tough + heavy.

Super late on this but I just got a PLA printer. Was wondering where you got that M9 Bayonet model at 4:26 :)

Fun, interesting and scary all in the same proportion.👍

ASA is great for making weapons. It's very tough, strong, rigid, and UV resistant.

Always a good time with sharp things.

I couldn’t believe it, you sound like exactly Akidearest. The way you talk, how you sound and editing itself. You two basically identical.

Currently watching this while 3d printing myself a gravity knife.

Back when I was into pellet guns you could buy these pellets that had a hollow point and a plastic tip glued into the hollow point (so it wasnt hollow anymore I dont know an english term for it but the german one is spitzer IIRC) it was designed for bird hunting apparently, it would strike the bird, discarding the plastic tip for increased penetration. Also nurses practice injection techniques on oranges around here, because the skin and layers below apparently break in a similar manner. These are my completely unsolicited and probably annoying anecdotes and suggestions. Also your cat = cute.

Now you need to 3d print a knife gun

This woman is a real chad I've never seen a woman take the phrase "go to the kitchen" as a joke

*the uk wants your location* *slaps channel I just found* I love it. I am now subscribed

In case anyone asks: FBI rated Ballistics gel is meant for ballistics testing of FIREARMS. its designed to test how bullets penetrate the ballistic gel, their trajectory after hitting it, how far bullets would penetrate, etc. It is NOT designed to test the lethality of melee weapons let alone improvised melee weapons. if you want to test melee weapons or any type of melee object try pig, or human gel molds of dummys with human body parts and blood in it. This would give a better idea of how effective melee weapons would be. the human like gel molds are generally softer and closer simulate human flesh/skin and thus produce more accurate lacerations (cutting) marks on them for knife wounds. ballistic gel blocks are designed to measure ballistics ie firearm bullet wounds.

This will be very useful in the streets of England

If you want a reeealy strong printed knoife, make print it flat on the side of the blade and alternate line direction [0,90] every other layer will run lines from the tip of the blade to the handle then the other layers crosshatch with lines across to lock everything in place.

A while ago I had 3d printed some fdm batarangs and no joke even without sanding and all that jazz they almost when completely though a cardboard box. So yeah It can be pretty scary.

Now we need to 3D print entire arrows 😮😮

Have you considered silicone caulk for keeping multi part mouls leak proof? I don't want to tell you your business as I'm not a 3d printer but man that's a lotta leaks.

if you weighted the handle , could it throw better?

i can indeed confirm the fact 3D printed knifes are sharp because i have sold them at a school before, the results were not what you´d expect.

You should print the blade laying on its side so the layer grain runs length-wise. This'll keep the blade from breaking off into the target

this is genuinely scary

For ballistic gel its best to leave it for a week to firm up

The leak had big Adam savage in mythbuster vibe