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.
morrisme1 year ago

cool. 4*.

It's fine if u have no bendys. I feel your pain. There are many knex pieces I never heard of!
w8.. does it lock down in place by its own
ashchetm5 years ago
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)  ashchetm5 years ago
Very nice. Good job.
Thanks! It wasn't hard, I just thought it would be nice to open it easier.
Whaleman (author)  ashchetm5 years ago
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.
Yay for community help! POWER TO THE PEOPLE!!!!
stopanator5 years ago
sorry hailo said that darth acexxacer to tell him kinda what it means you where abiut so say mutalate but said enhanced...
Whaleman (author)  stopanator5 years ago
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.
stopanator5 years ago
when he says multila i mean enhance cuz mutilated
Whaleman (author)  stopanator5 years ago
What does that even mean?
stopanator5 years ago
nice one
NYPA6 years ago
i wouldn't mod a piece for a K'NEX knife.
Whaleman (author)  NYPA6 years ago
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)  Whaleman6 years ago
'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. '
me tooooooooooooooooooooooooooooooooooooooooooo!
wat purpace does the mutila i mean enhanced gray conecter serve?
Stopping the blade. : )
i'snt there a peice like that anyway - a black ball joint connector?
Whaleman (author)  jabbathegut17 years ago
There is. But if you are using it for a gun as the chamber, then you should cut the pieces, a ball joint won't work.
Whaleman (author)  darth acexxacer7 years ago
it stops the "blade" from coming too far out, but a ball joint connector will work too.
dsman1952767 years ago
ues a black balljoint insted of cutting the grey connector
Whaleman (author)  dsman1952767 years ago
You can do that if you want.
i found using a black hand works really well.
DANGIT! You beat me to finding it out.....
DrWeird1177 years ago
how does it flip open and closed?
Whaleman (author)  DrWeird1177 years ago
By using the momentum caused by the flicking of your wrist.
I changed the female connector for stopping the blade to a black hand. Works better. I used this as a handle for a pistol, like Metal Gear Solid CQC.
vinman927 years ago
I have a knex bqailsong that I made its way big and not to hard to make should I post
Whaleman (author)  vinman927 years ago
No, because bqailsongs don't exist. Did you mean "Bail Song"?
sorry man you know what i mean i was in a hurry but what you think otherwise
It's actually balisong.
there is no video
Whaleman (author)  daytje psv 4 life7 years ago
Yes there is. Did you not click on the .avi file?
you need to kill peices for this?
Whaleman (author)  I_am_Canadian7 years ago
No. The decapitated piece can be replaced with a ball socket.
juneapaluna7 years ago
I mad one without the orange bendies but it bends a little bit,Im too lazy to post it unless you guys want me to.
i want to know what you used instead
ojochris7 years ago
where did U get the Short Bendys? P.S. Isn't there a piece that is a decapitated grey piece?
jli1 ojochris7 years ago
i have mutila... i mean enhanced grey pieces a lot lol
ojochris jli17 years ago
Ok, you don't need to, uh... how can I put this... "injure" a grey piece if instead of a red connector use a green one on the knife.
jli1 ojochris7 years ago
well, i haven't made it anyways, so don't bother to tell me lol
I mean the hinge of the blade (I wasn't too clear in the last comment)
ojochris jli17 years ago
jli1 ojochris7 years ago
response in 15 mins lol
Whaleman (author)  ojochris7 years ago
From a knex set. You can use a ball-joint connector if you want.
J_SCAP7 years ago
hey can you make a blade that dosent use bendy peices (i dont have any :( )
ojochris J_SCAP7 years ago
Post pics of it.
thebboy7 years ago
ya i made it. would post picture but camera act weird.
Why does everybody talk about random stuff?
dramamine7 years ago
I want to build this but I only have the large, green bendable knex. would they work if I extend the handle or anything?
Whaleman (author)  dramamine7 years ago
It would probably work.
Okay, I'll try later after I've finished my little knife/swordy type thing.
i want to do this but i dont have the orange bendy sticks. is there anything to replace it?
Whaleman (author)  GorillazMiko7 years ago
one yellow rod will work
smidge1478 years ago

yer check out my computer lol soz if this is spam.
Whaleman (author)  smidge1478 years ago
Cool, did you make it? Looks EVIL (-.-) BTW No, of course I don't consider this spam, hell, I'll even go as far as showing my own PC
Whaleman (author)  Whaleman8 years ago
yes, that is mike rowe in the background
gotja Whaleman8 years ago
dirty jobs?
Whaleman (author)  gotja8 years ago
Ya, he is slashing dead salmon in half.
HAHahahaha!!!!!!! I like that one. I thougt it was funny when it didn't cut all the way through. (it's cool he is cutting and this is a knife instructable. i don't have bendy pieces, but no prob it's a hacksaw now. I modded the morretti so it's a plasma sniper looks the same as the one on Time Splitters future perfect. ( also that game is COOL )
yes my computer is custom built except the case i didnt make lol
Whaleman (author)  smidge1478 years ago
Oh, where'd you buy the case?
www.maplinelectronics.co.uk i dont think they sell it any more but other site do its called cobra case.
Whaleman (author)  smidge1478 years ago
oh, ya, I probably wouldn't buy it cause shipping from the UK is expensive and takes a long time, I got my case from costco
darkmuskrat7 years ago
maybe replace the outside or the "blade" with an actual knife. it might be more intimidating
Whaleman (author)  darkmuskrat7 years ago
Yeah, but I could get sued for that!!!
whoever7 years ago
Yeah i agree with gizmoman that doesnt make any freakin sense.
you know me8 years ago
i kill you all wit the DOOM3 60 cal. CHAINGUNS(aka S.A.W. BULLET BELTS!!!!! [insert evil laugh here]
Whaleman (author)  you know me8 years ago
Oh yeah! Well lets see how well that does after it has been NUKED! Muwahahaha!
if you are going to argue over who got the better weapon then ill get my trusty 'ol lightsaber (may the shwarts be with with you)
Whaleman (author)  the gizmoman8 years ago
That is actually a ring, thank you very much! I think space balls is better than star wars.
the shwarts is in you, the ring came from a crackerjack box (who do you think is better darth vader or dark helmet??)
Whaleman (author)  the gizmoman8 years ago
Dark helmet, DUUUUHHHH, darth vader is all burned up, and dark helmet only burns himself when he tries to drink coffee
i was thinking dark helmet too darth vader was too whiny befor he got his parts forcefully removed(burned off with every thing else in revenge of the sith. sure thing jack sparrow & vader never met ;)
Yep. Jack would make some comment about his being a eunuch not realizig it was actually true. Then Vader would try to kill him by force-choking him. Than Jack would save himself and kill Vader by trying to talk his way out of it. Vader is not a thinker so the thinking part would be such a shock, that he'd have a heart-attack and DIE!!!
don't you mean "brain-attack"
Whaleman (author)  the gizmoman8 years ago
Yep, but the pirates and the clones never met either, it would have been cool to see what would have happened
i hope your were talking about the undead crew inthe 1st potc
Whaleman (author)  the gizmoman8 years ago
Yeah, I was. It would be cool. Invincible pirates versus an unlimited amount of clones.
Personally I think that the undead pirates would win. Unless Jack and Will were somewhere around with the last medallion and a knife...
Yeah, the pirates would win, they can think for them selves, while the clones only know how to kill, not to be strategic
ill gust set off halo and run into a bolt hole( i think this is a extra dimensional pocket)
im telling ewihelm
on wat?
oh also i think he has a radio station! eric wihelm on an am station lol(im seriuos)!
J_SCAP7 years ago
yay im usefull
Whaleman (author)  J_SCAP7 years ago
Dude6877 years ago
that's sweet!!!!
Whaleman (author)  Dude6877 years ago
Whaleman (author) 8 years ago
Awwwwwww, fine, prevent a nuclear war! See if I care!
bunduk8 years ago
hey i made it and have moded it so it stays in and out really well and comes ou with a little switch that is easy accesible check out my new forum topic
Whaleman (author)  bunduk8 years ago
Vynash8 years ago
i love this thing it rocks
smidge1478 years ago
ill just use a straight peice and use it as a gun un-jammer
Whaleman (author)  smidge1478 years ago
knexguy8 years ago
looks nice, i will build it now! first comment!
noob!!!!!haha u used first comment btw this knife looks funny but i wont be building as i dont have bendy pieces.
Whaleman (author)  smidge1478 years ago
i wasnt calling you a noob lol ur kl
Whaleman (author)  smidge1478 years ago
I know, you were calling him a noob for saying first comment. I was saying "awww" cause you don't have bendy pieces
flames103918 years ago
Vynash8 years ago
im gonna build it now looks awsommmmmmeee
Kaiven8 years ago
with the band on, it maes the knife stick out a tad
Kaiven8 years ago
that looks... PRETTY!!! PRETTY COOOOOOL!!!
Mike Cortes8 years ago
Dont have the bendy pieces either, but i might actually put a knife, lol. ooooooooooooooooooooh dangerous. ill make one later when i get home from Cornwall to London.