Introduction: Knex Switchblade (Now Improved)

Picture of Knex Switchblade (Now Improved)

This is my knex switchblade. It was inspired by J_SCAP's butterfly knife. I decided I would make a switchblade, so it would lock in the open position or lock in the closed position (well, sort of), as the video shows (I hope you can view it). Hope you enjoy! Post pictures or videos if you build it!

This can also be used for self defense training if you add some of your sister's lipstick to the edges, that way you know if you have been cut and if it was a puncture or a slash. Although if you have the money, you should probably buy an actual rubber knife.


NOTICE: Yes, you can make a comment that actually has nothing in it. Just because Mepain and I did it two years ago does not mean you can spam up my instructable.

Step 1: Materials

Picture of Materials

This is all you will need. Exactly. I know this because I took apart the knife and rebuilt it from memory.

Step 2: The Frame

Picture of The Frame

This will become the frame of the knife.

Picture 1: Build these.
Picture 2: Mutila... I mean "Enhance" a grey connector.
Picture 3: Attach it here.
Picture 4: Attach a red connector here.

Save the other part of the frame for the next step.

Step 3: The Blade

Picture of The Blade

This is the blade very simple.

Picture 1: Build.
Picture 2: Attach it here.
Picture 3: Attach the other half or the frame.

Now you will need a rubber band for the next step.

Step 4: Bands

Picture of Bands

Attach a rubber band as shown in the pictures. The "improved" version (last three pics) can flip open much easier, but can't be flipped closed. I like flippy stuff. I have flippy pens, combs, knives, knex knives, pocket knives, and more!


morrisme (author)2014-03-19

cool. 4*.

Transforminglegodude (author)2013-05-15

It's fine if u have no bendys. I feel your pain. There are many knex pieces I never heard of!

destroyo5457 (author)2011-01-12

w8.. does it lock down in place by its own

ashchetm (author)2009-09-28

I built this knife a while ago, but pulled it outta a toy pile today, I modded it to have a switch, works great, would recommend it to anyone considering making this knife.

Whaleman (author)ashchetm2009-09-28

Very nice. Good job.

ashchetm (author)Whaleman2009-09-29

Thanks! It wasn't hard, I just thought it would be nice to open it easier.

Whaleman (author)ashchetm2009-09-29

Yeah. The problem when I was designing it was that I was trying to have an auto-opening style blade instead of an assisted-opening blade. Now I can see that assisted opening is better.

ashchetm (author)Whaleman2009-09-29

Yay for community help! POWER TO THE PEOPLE!!!!

stopanator (author)2009-09-16

sorry hailo said that darth acexxacer to tell him kinda what it means you where abiut so say mutalate but said enhanced...

Whaleman (author)stopanator2009-09-16

No, seriously. I can't tell what you are saying. Use some punctuation, use some spell check, and actually spell out my name. It's not that hard, stopanator.

stopanator (author)2009-09-13

when he says multila i mean enhance cuz mutilated

Whaleman (author)stopanator2009-09-13

What does that even mean?

stopanator (author)2009-09-13

nice one

NYPA (author)2009-08-08

i wouldn't mod a piece for a K'NEX knife.

Whaleman (author)NYPA2009-08-08

You don't have to. You can just use part of a ball joint connector. But if you've been knexing for awhile, you probably already have a few half pieces.

Whaleman (author)Whaleman2009-08-08

'Mykhailo (author) says: Oct 30, 2007. 9:18 PM it stops the "blade" from coming too far out, but a ball joint connector will work too. '

Whaleman (author)2007-09-03

Ima cutyu up wit my combat knife... VVhat now! (wit a Deutsch accent)

gotja (author)Whaleman2007-09-03

u kno wat ill just shoot yall with my bereta

Whaleman (author)gotja2007-09-03

Dammit! I guess I will just have to go get my Browning M2HB .50 cal. I hete usin it, the bullets are so expensive!

the gizmoman (author)Whaleman2007-09-05

up close, sawed off, double barreled 12 gage shot gun mwahahahaha!!!

Whaleman (author)the gizmoman2007-09-07

Jackhammer Mk3A1

jollex (author)Whaleman2008-09-04


oh no,here comes my cobra attack helo with mounted 50. cal miniguns(not even real) and 10 auto loading gernade launchers.

ill shoot your cobra down with the scorpion tank(from halo)Mwahahahahahahahahah


ill just send master cheif over for a little visit,case closed!!!!!!!!!1

last time i heard master chief is still fighting to save the earth in halo3 so he wouldnt have time to come to your aid

Nope, I BEAT IT. do you play half-life?????? I need a buddy so i don't get pwned.

i beat it about 2 weeks ago(halo) sorry but i dont have half life i still cant believe that they killed off the master chief

strange i did not like halo2 and 3. half-life and half-life 2 are fun.

I'll blow the tank up with a rocket launcher. What Now!?!?!?!

you still have to get past my MG and rockets first

*snorts* You can't shoot what you can't see. Anyway, I'll just run up to you and beat you out of it.

all i have to do is position the tank to where you have to come out in the open to get the shot and a rocket leaves a trail of smoke

You ever heard of the hit and run technique? Anyway, What good would blowing it up do? I'll just beat you out of it, stick you and run away and get back in the tank after you've died.

Don't make me take out my A-10! Or should I use an ICBM? Your choice.

ok,you lost me you.

Ha! You have nothing better than a Jet fighter, with 30mm Gatling gun and sidewinder missiles, and a Inter-Continental Ballistic Missile! I will now consider your unconditional surrender.

the gizmoman (author)Whaleman2007-09-05

ill ask the emperor if i can borrow his death star for a little while (oops there goes the planet)

Whaleman (author)the gizmoman2007-09-06

Sorry, I already have my own personal Death StarTM

the gizmoman (author)Whaleman2007-09-06

then ill blast you away with dark helmets spaceball one star ship at ludicrous speed

Oh yeah?*aims jar of rasberry jelly at ship* You'll lose the bleeps, the creeps, and the sweeps.

Now I shall go get the mega-maid and suck all the air from your deathstar. Mwahahahahahahahahahahahahahahahahahahahah.

the spaceball one is the megamaid stupid and as i recal vogons werent smart enough to steal the winnebago anyway

Duh. I knew it I'm surrounded by ***holes. I know the Mega-

1 the winnebago is the only ship w/the rader jamer thing 2 vogons is in your title so i asumed you were one (i forgot you woudnt need to steal the maga maid/spaceball one anyway ,your vogon ships are planet distroyers any way)

Yep my vogon ship is. That means that I won's have much trouble catching the winnebago. Anyway My vogon ships would rip the radar satelites off passing by it. So what do I need a radar jammer for anyway?

vogons are stupid all they do is sit around reading vogon poetry all day

Oh freddled gruntbuggly, Thy micturations are to me As plurdled gabbleblotchits On a lurgid bee. Groop, I implore thee, my foonting turlingdromes And hooptiously drangle me With crinkly bindlewurdles, Or I will rend thee in the gobberwarts with my blurglecruncheon, See if I don't! Tell me, do you like my poetry. And what does this have to do with anything?

what the crap is that doesnt make seanse

Of course not do-do. it's not supposed to.

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