Assassins Creed Style Wrist Blade

About: Just trying to make a perfect final product

What did you make?

I've made a wrist blade that is inspired from the video game series Assassin's Creed. I spent a lot of my time trying to find a design I liked of this style knife but after a long time searching I never liked any of them so I decided to build my own, incorporating bits from many other designs. Only after the fact did I realize the mechanism compared to that of an Out-The-Front knife or OTF knife. This mechanism works when a platform is pulled forward with a slider that catches on the blade therefore causing tension and when the platform clears the door, the blade flies out and locks in the other position. This was made with lots of super glue and popsicle sticks. I also came up with a material for myself, I'm sure other people have thought of this before but I took a piece of board from a notebook cover and covered it in superglue and when it hardened it was a great material for many parts of the build. I also made straps from an old leather shammy and yes, they are yellow.

How did you make it?

Before I made this I had never owned one of the video games but I had played them before and loved the idea of a retracting blade to fit on my wrist. I tried to find a design I like so I could build it but I couldn’t find one I liked enough and decided to incorporate a few different ideas into one. I did work alone on this project. My plans had to be changed hundreds of times because mostly I would do trial and error and the idea I had didn’t work.

Where did you make it?

I made this t a desk I had set up in my living room with poor lighting and a mat to protect the desk. Obviously being considered a weapon though it isn’t sharp I wouldn’t be able to make this within school premises so I built it after school and on weekends whenever I could. This connects to my life in a way that I enjoy working out mechanisms and building them but my interest in the actual game wasn’t really a part.

What did you learn?

The biggest challenge I had building the knife was to get it to close as well as it opened. It would always snap open but when I tried to close it it wouldn’t have enough power. I had to balance the power of the rubber bands with the position of the locking doors. I think once I got the knife to open and close was my proudest moment during the build. It was easily the most difficult part of the whole build and once that task was conquered it was smooth sailing.




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    6 Discussions


    5 years ago on Introduction

    Do you have a how to or blue prints for this design? I must ask this because of all the different designs, this is the model I was looking for.


    6 years ago on Introduction

    Honestly, I have been designing these blades for years, but due to lack of tools and materials, they have just been sketches until recently. given the materials, it is hard to see what you built exactly, but also given the complexity of the mechanism itself, I think you did a great job. I take it from the trigger mechanism that this is a true DA-OTF blade? also, is the blade metal? I ask because you will want to be careful with local laws. in most states, DA-OTF blades (also known as a switch blade) are illegal. some states it is okay to own them and display them in your home, but it is not legal to take them out. Just looking out for you :)

    1 reply

    Reply 6 years ago on Introduction

    Thanks, it is a true OTF mechanism, in the first picture you can see the carriage clearing a locking door. The blade is unfortunately only made of hardened cardboard but thanks for the warning, I dont think I would take it anywhere out of my house anyway.


    6 years ago on Introduction

    I wasn't trying to make it to be as sturdy as I could, I was trying to make a mechanism that required minimal manual actions. Also I didn't have access to things like that, I've gotten better tools since then but I did what I could with what I had.