Introduction: Knex Hidden Blade

Picture of Knex Hidden Blade

I was playing Assassin's Creed the other day and I really wanted one of those awesome Hidden Blades, so I made one out of K'nex. It uses a low amount of pieces, it's easy to conceal and the blade locks in place when it's out, so it can be really dangerous.

Step 1: Required Pieces

Rods :
2x Grey Rods
3x Bendy Grey Rods (Purple)
1x Green Rod

Connectors :
1x Light Grey Connector
1x Orange Connector
9x Red Connectors
5x Tan Connectors

Other :
A Rubber Band
29x Blue Spacers
You can replace 3 Blue Spacers with 1 Grey Spacer, but you need to have at least 5 Blue Spacers.

Step 2: The Base

Picture of The Base

This is the base of the Hidden Blade. It's very simple.

Step 3: The "Blade".

Picture of The "Blade".

These are the two types of blades, but if you use a sharpened blade then it easily gets caught in the trigger and jams. You only need to build one.

Step 4: Putting It All Together.

Picture of Putting It All Together.

The final instructions to getting it all together.

1: Put the Blade into the Base.
2: Attach the Rubber Band.
4: The "straps". If you don't have wrists as skinny as mine, well, I can't think of anything. You can find a way to make them wider. =P


metalsonic (author)2013-03-23

cool !

lambolover9715 (author)2013-02-18

Doen't bloody work

The Cannoneer (author)2013-01-29

My wrist doesnt fit the flexi-rod holes.
Any ideas on how to make them bigger?

lxDlolomomo64 (author)2012-07-16

your creation is very creative :D
can you look at some of my creations :D

jaffawarrior1 (author)2012-02-16

awesome i aint made it yet but it lookz siiiiiik

aiverson1 (author)2011-07-15

i have no right to say this because this is my first post and i have no ibles cause i got no camera
but sir u fail 3/5 tho for concept

lou33mig41 (author)2009-04-04

ive jst modded it. now it does :P

jrobison2 (author)lou33mig412011-06-27

how did you do it i cant get a lock or launch

DaNG 95 x (author)2011-06-20

Havent even made it yt but looks siiiik! :D

lilnorm123 (author)2011-06-14

best ever

fingerless (author)2011-05-09

this is awsome i just made it and cant stop using it!!!

brettw88 (author)2010-11-21

hey thanks ive been looking 4 an easy guide to makeing one of these...YOU ROCK DUDE!!!

thatgreasymechanicguy (author)2010-10-03

sweet mine can't lock(my own)(not this one) so how does this one lock? im gona try 2 figger it out..................

SDW071 (author)2010-07-12

Hey Im new here but I was looking for hidden blades I built it and rebuilt the Piece that holds the blade to your Arm using two arm bands and a couple more rods and connecters the arm bands hold tightly to my arm and works great!!!!!!!!!!!!!! I'll post pictures later.

SpeedStrikerXLR (author)2010-07-11

its basicly a gun with no ammo and an oversized ram.. but any way cool idea

tysanio (author)2010-03-24

good to make

hockys1 (author)2010-02-26

 i modified this a little bit to use less pieces but on the bright side great blade

darlarshannon (author)2010-02-06

if the inventors of these toys submit them to lego and k'nex they could makr millions

jm121 (author)2008-08-10

this is my hidden blade

bighead5454 (author)jm1212009-12-31

make an instructable 4 tht plz plz plz plz

Izokay (author)jm1212008-08-11

this second you will make an instructable for that. that looks so sweet!!

jm121 (author)Izokay2008-08-11

if you want i will make an instructable for my blade

Dead Jakc34 (author)jm1212009-05-12

DO IT! That would be awesome!

Izokay (author)jm1212008-08-11

that would be awesome. thanks!

jm121 (author)Izokay2008-08-12

i have just started working on it.

bowmaster (author)jm1212009-03-17

POST IT!!!!!!!!!!!

ninjutsu (author)jm1212008-09-22

man that would be sweet! make an instructable for it!

d4rksaber (author)jm1212008-09-06


bighead5454 (author)2009-12-31

i made something similar cept u needed to pull a string to move a piece tht lets the blade pop out which was rreally cool the downside: it took up the whole arm literally check out my armour to see for yourself  it was basically a long rectangle tht u put on your arm if i can remake it to fit on an arm secretly i may post

nehitheterrorist (author)2009-10-11

mine wont lock

mo5 (author)2009-09-14

lame but cool

Warioman90 (author)2009-08-25

cool yeah i figure out the switch , but i didn't have any blue ring thingys so i looked and found some bigger grey ones but yeah it works pretty good and i used a wrist band tht a had laying around

mister lamp (author)2009-04-30

i got it to fit on larger arms

mister lamp (author)mister lamp2009-04-30

its a little uncomfortable but it works.

lou33mig41 (author)2009-04-04

i made 1 of my own but it doesnt lok wat is the trigger for urs, mines a blok

13remco13 (author)2009-01-03

this is cool,can some ppl post their mod for this blade?id like to see some better versions(so the sharpend blade wont stuck or something)4.5stars good idea!

bighead5454 (author)2008-12-23

i read about the ideas of sharpening the rod but what if it like got caught on your hand there would be blood EVERYWHERE and it would hurt REALLY bad

Landon Sullivan (author)2008-12-04


j-chode! (author)2008-06-29

this is quit sneaky tbf. i like alot. one slick hand movement and you can slice your enemies throat.

apples!!!!! (author)j-chode!2008-06-30

sharpen the gray rod :D

Bartboy (author)apples!!!!!2008-11-27

Or widdle it down, so its flat like a real knife.

Onii (author)apples!!!!!2008-06-30

The sharpened end gets caught between the Green Rod and the Light Grey Connector when you pull the trigger, it's really annoying.

apples!!!!! (author)Onii2008-06-30

hmmm..i noticed that. ill try to fix that :)

knexdude152 (author)apples!!!!!2008-07-26

put tape on the connector

apples!!!!! (author)knexdude1522008-07-26


knexdude152 (author)apples!!!!!2008-07-27

put some scotch or another tape around the grey connector i hav not tried this but it just came to my head like this blade sword sheath duct tape

apples!!!!! (author)knexdude1522008-07-27

uh...still would be funky. i was thinking to use a blue tab as the block, so its perfectly smooth whilst being rigid...just have to find a way to adapt it on

in a pencil sharpener

well, yeah thats easiest.

kung-fu- (author)2008-11-02

coolest ever made with knex you sir are my hero

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