Instructables
Have you ever wanted to sneak a knife somewhere? (Not saying you should) Well here's a way to sneak a knife in a Sharpie marker. Thanks to Pat Sowers for the idea of making a blade with a binder. Please check his instructable because it is a pretty good one. I'm making the blade with a binder because its easy to obtain. You can always use another way. If you are 18 and under and making this knife to bring to school, PLEASE don't. You can get immediately suspended, expelled, or go to jail for position of a knife in school. Also if you're under 18, please have parent or guardian supervision.
 
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Step 1: Legal Stuff

I am not liable if you harm anyone or anything with this knife. I am not liable if you hurt yourself or lose a friend because you accidentally cut him/her. I am not liable if you get caught with the knife and go to jail. I am not liable in you get suspended, expelled or go to jail. Be safe and stay in school.

Step 2: Materials

You're going to need :
A binder (For the blade. I used a 1 in. binder.) Please use an old one. Don't waste a new one.
Hot Glue
A file (You'll see why)
Some way of sharpening a knife (Whetstone, Files, Ect.)
Snips
Channel Lock Pliers
And of course a Sharpie marker. Also use a one that ran out of ink. Don't waste

Step 3: Taking apart the binder

The only thing you'll need is the metal part. I suggest you use a used binder so you don't waste a perfectly good binder. Take the metal part apart and try not to scratch it up to much unless you want it that way. Bend the edges out of the metal thing (check second pic.) After it is bent out, it will be easy to take out the parts you want (check second pic) Any questions on the binder step refer to Pat Sowers' Instructable first before asking me questions because it is a pretty good one.
Pyromaniac885 months ago

This is really cool, although it could use some improvements

Dom Toretto7 months ago
A good idea would be to take a blade off an old broken multitool and use thay
dwmanz2 years ago
Why the binder? I can see that the shape adds rigidity, but so would using a piece of .125" 01 tool steel. Easier still would be to remove the handle from an existing knife and grind the blade down to fit. X-Acto make a whole slew of blades that would lend themselves to this project, AND be sharp as heck. X-Acto even makes a pen style knife, but the top is clear, so the blade isn't hidden, which I'm sure is intentional. Either way, this would not get past any real security checkpoint. Bringing it to school would be dumb, since you would get into HUGE trouble as soon as you were seen using it for even the most legitimate purpose. BTW - I'm a knife guy, and when I went to school I amost always had an exacto knife for art class, a swiss army knife for all of the cool tools, and a Schrade folding hunter just because it was cool, and all of my friends had folding hunters. I'm not picking on you, just cautioning you that knives are viewed very differently now, and just being seen with something like this can really get you into deep doo. Be careful!
poofrabbit2 years ago
Oh I so want to see this in a movie, the lines that could be said about a sharpie knife! I hope you entered this in the spy contest! Well done!
weswert (author)  poofrabbit2 years ago
I did. Thanks alot!