How to Make a Butterfly Knife Pen


A butterfly knife pen, also known as a balisong or fan knife, is an everyday carry writing utensil that can also be used for self-defense. A butterfly knife pen features a pocket clip on the handle to be attached to a bag or purse strap and taken along anywhere you go. Some even feature glow-in-the-dark details such as logos or handles, which are easy to see in low-light areas.

How to Make a Butterfly Knife Pen

Using a butterfly knife pen is simple; open one of the two hinged pieces near the base of the blade and insert your favorite fine point ink cartridge into place between them before closing it again.  In this article, I will discuss how to make a butterfly knife pen. So let us get started.

Step-wise Guide on How to Make a Butterfly Knife Pen

  • Get a pen and spread the colors on it by color mixing for your desired look.
  • Cut out six thin strips which are slightly longer than the width of the butterfly knife handles attached to the pen. These will be used as blades of a butterfly knife and will have holes drilled through them later.
  • Using emery paper, sand down the edges of each blade so that they can slide smoothly into their respective openings in each handle. Put some glue around each opening; once you press a blade into its opening, then move up with a toothpick or matchstick till you reach where there is enough space between the blade and handle so that the blade can move freely with some space.
  • Attach two half-butterfly knife handles to the ends of Pen, like:
Attach Two Half-butterfly Knife Handles
  • Slide the holes of each blade into their respective place on either handle and hold them till they dry. The glue will tighten once it dries so that both blades can be fixed without falling out.  If you want a smooth transition between two adjacent blades, then do this: using an Exacto knife, make a shallow half-cut into each side wall of your butterfly knife pen’s body every inch or so.
    This way, when you insert the blade in its hole, it will be easier to slide because there is less pressure around the entry point of the next blade as well as there won’t be any bumpy transition between two adjacent blades due to half-cuts made earlier.   After the glue dries, make sure it is scorched before cutting a piece of paper and writing on the pen.

You may also replace the pen with a paintbrush and use it as a normally painted butterfly knife.  Also, you can color the blade on both sides using acrylic paints. After drying them, then bend the paint/glue-covered blade back and forth 10 times or so; this will give your blade two colors after it dries hard.  

Precautions While Making a Butterfly Knife Pen

Butterfly knives are illegal in many states. If you plan on making a butterfly knife, do it for your own knowledge and use it only at your own risk.  Never make a butterfly or assisted opening knife to sell, lend, distribute or give away to anyone! Butterfly knives can be dangerous if handled carelessly. This project is intended for educational purposes only. Read all safety warnings before beginning this project.

Use extreme caution when working with such blades, as they can cause serious injury if not handled safely. We are NOT responsible for any harm caused by following the instructions in this article/video! When making a butterfly knife, please ALWAYS wear safety goggles and gloves to protect yourself from possible eye injuries that may occur while handling the edge of the blade!

When making a butterfly knife, always remember that you are handling an extremely sharp object and use extreme caution when working with it. If you have any doubts about your ability to handle such a blade without injury, we strongly suggest that you do not attempt this project.

In addition, these knives are NOT manufactured under quality control conditions nor hand-inspected for safety or defects before being shipped out to retailers! This means if you purchase one of these knives, there is no guarantee what the condition will be when it arrives at your doorstep (defective parts/joints/blade, etc.).

Butterfly knives can also be purchased in different configurations (Fixed Blade vs. Folding). The folding versions tend to have more moving than fixed blade versions. If you plan to make a butterfly knife, we highly suggest purchasing the fixed blade version for your own safety.

Advantages and Disadvantages of A Butterfly Knife Pen

Butterfly Knife Pens are easy to make, easy to make. They will always impress if you give them; however, they have a few advantages and disadvantages to consider before making one.

A butterfly knife pen has two main parts, the handle and the blade. The handle is shaped like the handle of a butterfly knife (hence their name) with an opening cut out in the center for where your hand can go through.

A Butterfly Knife Pen Has Two Main Parts

It’s usually made by bending sheet metal into shape, although they can be found cast in plastic or resin. On the other hand, the blade is just a hollow tube that fits over the handle of your butterfly knife pen. You can get creative with this part as it doesn’t actually touch anything but air so that you can make a blade out of almost anything, such as wood, aluminum, steel, and acrylic.

The advantages are that butterfly knife pens are easy to make with the right tools (such as a grinder or drill), inexpensive to buy, and always impress people, as I said before. The disadvantages include that the metal used for the handle is usually thin sheet metal and will bend if you grip it hard enough. And that even though the blades don’t have to be sharp at all, they still will cut if accidentally swiped across something.


This article is intended to give you step-wise instructions on how to make a butterfly knife pen and things you can do after finishing making the pen. Ensure proper safety while making the pen and always use it with the supervision of specialized personnel. Thank you and have a nice day!

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