Step 3: Launch Barrel

The launch barrel is made from the cap of a large marker. Ensure that the cap you use is a larger diameter than the ballpoint pen. Create an opening in the closed end of the marker cap by either using a wide bore drill bit or simply cutting the end off the cap. Use caution as this part can be tricky and fingers can get hurt if you're not careful.

Next, snip your rubber band and tape each end to the outside of the marker cap on opposite sides. Use plenty of tape to secure the rubber band in place. Lastly, wind a small amount of masking tape in the centre of the rubber band after it's been attached to the marker cap, this will act as the catch when you arm the grappling hook gun.
<p>how do i remove the pen bottom</p>
<p>so i didn't have all the items you listed, but i had some substitutes. instead of a pill bottle i have a marker cap. instead of the marker cap on the top i used the center of the spool of dental floss. it isn't too great, but i think if i tinker with it i could make it better. thanks for the design!</p>
<p>Substitution is the name of the game! Glad you could make it work with the supplies you had. You should upload your videos to YouTube and share the results with other, too! </p><p>Thanks for sharing your version, enjoy the Pro Membership.</p>
<p>this is sweet</p>
You are going on my Awesome collection.
This is freakin beast! Best thing I've seen on Instructables for a while. (Yes, I've been creeping for five years or so without an account. X3)
This is the coolest thing on instructables
Made my own it probably doesn't shoot as far but it is more concealable
Does anyone know where I can get a travel size plastic bottle 3.4 fl. oz. or smaller?
Teachers beware that's hilarious
Love this mike! I made a penny/ change cannon since my friends started a penny war. I'll make an instruct able sooner or later.Keep up the good work!
Nice. I made one using the Youtube video here: <br>http://www.youtube.com/watch?v=b__hTORlR_Y <br>Very cool.
The motor to wind it back up does work I've done it before
The motor to wind it back up does work I've done it before
I made one too.. I just lost it in our old house. My brother shoots it and makes the hook grab onto my shirt and he pulls me.. It's kinda annoying when my brother uses it.. But once I use it it becomes less annoying and more cool and spy-like.
totally one hindered and infintity percent awesome
how far can it shoot?
Does the gun work cause I haven't tried it yet
Thank you
This is my gun
Nice looking grapple! How far does yours go? <br />For sharing your version I've awarded you a 3-month Pro Membership and a digital patch. Way to go!
I made it and it didn't work!
What didn't work? Show us pictures!
Teachers beware!
nice idea thanks you ı can't wait to make this
stop removing my gun or i am really gonna be pissed!! please mikeasaurus i am following you this gun is one of my favourites what else do u want me 2 do? for heaven's sake stop this!!!!
Sweet grappling hook. FOr sharing your version you get a 3-month Pro Membership and a digital patch!
Than mike
thank you very much!!! this has been my in one of my two favourites i mean,this gun is so cool!!!!!!!!!!!!&iexcl; whoops upside down exclamation mark.........
That, my friend, is pure epicness. One more reason to stall on my homework, consider me inspired. If you'll excuse me I'm going to search my house for supplies. I'll take pictures.
Done. Sorry for the bad quality, I took this picture with my webcam.<br>I also wasn't able to keep the hooks on long enough to taker the picture- whoops!
Thanks for sharing your version! You get a digital patch and a free 3-month Pro Membership. Enjoy!
where is my own digital patch and a free 3-month Pro Membership!!!! please give me one 2!! or else i will ******!!!@@###%%**&amp;*&amp;&amp;__+(
Ahhh... stalling on homework.. Im doing it right now!
This is my grappling hook gun. I didn't have a wooden clothespin so I just release the elastic band by hand. I only have 2.7 m of floss though. But it shoots really good.
I made one too, but I didn't have a wooden clothespin so I had to use a plastic one. Now my hook don't shoot that far :(
i added another barrel to mine so it shoots pencils as well as the grappling hook! i hid the string, too.
Awesome, thanks for sharing! <br />Where/how did you hide the string? I would be neat to show us how you made yours on your project page. <br /> <br />For posting your version of this project you've been awarded a 3-month Pro Membership and a digital patch!
the string is curled up inside the M&amp;M tube handle, and here is a hole running through the lid and pencils base where the line comes out! i duct taped it so i could still use the tube without much difficulty.
You know what'll be cool, if you used a motor and attached it to the dental floss. That way, it'll be easy reloading.
My black and green version of the grappling hook. didn't shoot very far :( ,but it looks cool:)
Awesome instructable! I have tried to make many office supply weapons but none of them end up actually working. This one however, successfully shot the grappling hook thingy 5 meters!!! Hooray!
I think ill use a spool of thread
Didn't shoot to far. But I loved making it. <br>https://www.instructables.com/files/deriv/F9W/XU2N/H4VQDGFU/F9WXU2NH4VQDGFU.SQUARE.jpg
That looks pretty good! You should try it again with different materials and see if you can get it to shoot farther. <br /> <br />For posting your version of this project I'm awarding you a digital patch and a 3-month Pro Membership to Instructables; enjoy!
Is there a reason for the floss? Or can you use normal cotton string?
Floss is thin and light-weight, but any thin string would work well.

About This Instructable




Bio: I'm Mike and I make crazy things at Instructables HQ in San Francisco. Follow me and try a few of my projects for yourself!
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