Rubber Bands

Hey at my friends house his rubber bands break when we make knex guns and we think they need to be kept fresh so they don't become old so doesn't anybody have an idea on keep rubber bands fresh? Since I'm trying to keep all my guns in a show case but i don't want the rubber bands to be rotten when using it in the long run.

Topic by rexdino5   |  last reply

Rubber band cars.

Does anyone build them? here is mine

Topic by general zee   |  last reply

Best rubber bands

I make a lot of knex guns and was wondering what people thought were the best rubber bands to use on them are generally, and where to buy them. Also any website links would be much appreciated, thanks.

Question by the best person on this website   |  last reply

Powerful slingshot rubber that is very inexpensive and very easy to find?

Somthing like Strong Rubber Bands

Question by bwells2   |  last reply

How do I get the Star-burst rubber band off the loom at the end?

I have looped all the borders but I cant figure out how to finish it and get the bracelet off the loom. The end I finished looping the borders at is messy and confusing. How do I fix it and get the bracelet off?

Question by sullykids123   |  last reply

Y Answered


Question by bwells2   |  last reply

how do I paint on rubber?

I found this adorable rubber dragon in the bargain bin of my local toystore and would like to paint it to give it a costumized look. Unfortunately the toy is made from a material i'm not to familiar with. it's very stretch and it seems to me like it is made from supple rubber. It's sort of reminds me of a dog toy. so now I'm trying to find out what type of paint I can and can't use as I don't want it to start flaking. I'don't mind if the toy becomes stiff. I'd will be more of a display item anyway. Could I use spray paint? should I prime it? should i strip the current paint, and which solvent would be best that wouldn' destroy the toy. Any help will be very much appreciated.

Question by lpringiers   |  last reply

Why do rubber-bands break? Answered

All of my rubber-bands have broken and im mad. I want answers... NAO!!!

Question by MrSillyGuns   |  last reply

Knex Guns that do not use rubber bands

Guys, I don't have any rubber bands (I know I'm a saddo) and I love knex guns. I need some knex guns that don't use rubber bands. THANKS!!! 

Topic by Dude826Dude   |  last reply

making an IV training arm, any suggestions? Answered

I'm in nursing school right now and would like some extra practice practicing inserting IV's. My school as this training arm and I would like to make something in the vein :) of this, I thought about starting with a forearm sized piece of PVC and maybe attaching some very small rubber tubes to the outside and then covering everything in a small sheet of a flexible material that could be penetrated with an IV needle. Any suggestions?

Question by futurerescueninja   |  last reply

Klutz rubberband contest- K'nex

Now this has to be a competition we have a chance in. My immediate idea was for a plane, what do you reckon? Ideas welcome, and I may have a crack at it myself.

Topic by knexguy   |  last reply

How do I turn a green gas mask into a brown one? Answered

 I have a gas mask that I have been wanting to mod a little, and I need it to be brown.   Problem is, it is made of green rubber, and I'm not sure how to make it look leathery brown.  I'm not sure if I should paint it, or what type of paint works, etc.etc.etc. So, does anyone have any experience, or knows how to change the color of rubber? BTW, picture is of me, wearing said gas mask.

Question by Doctor What   |  last reply

Knex gun using a slide

I was told to post this in the forums, so here it is. I was wandering around this site and found a man that had created a pistol that uses a slide to move the firing pin instead of grabbing it directly. I made his gun and improved upon it. I turned his simple pistol into a rifle/SMG There are of course some problems: cannot handle rapid fire for extended periods of time single shot doesn't shoot far but cannot handle additional rubber bands. It's pretty cool though. Right now i'm trying to increase the range and make it more durable. But i can't think of how i can improve it anymore.

Topic by doomsday195   |  last reply

new knex gun

Hey i have made a new knex rubberband gun its still in beta testing but i am defenitley going to post it here and i dont yet have a picture of it (i cant use my moms camera) so i will work my best in mlcad its just killerks srv1 handle with a barell of my own creation i made it when i noticed i did not have enough peices to make his gun so i modded mine to make it rubberband gun compatable and i have done this a long time ago but i moded my knife and made a switch blade knife so if you want me to post the upgrades/new stuff yeah i will try and get a video up of each thing soon

Topic by J_SCAP 

Klutz rubber band power contest I wonder if a rubber band vibrating is considered 'powered'. Answered

I have some musical ideas with elastics as vibrating strings . can i use plastic stretching strings as 'rubber' substitute? Then the contest would interest me .

Question by mistic   |  last reply

Where to buy #64 rubber bands in the Netherlands?

Hello there, I was wondering whether someone knows where to get #64 rubber bands (i'm planning to use them on I_A_C's handheld heavy cannon) in the Netherlands. Thanks in advance, Bommelding.

Topic by Bommelding 



Question by luftwaffe29   |  last reply

Does anyone know a way to construct a fitted rubber bodysuit like those worn by cheesy movie superheroes?

I want to make either an Ozymandias or Nite Owl suit for halloween. I have not found a single instructable that outlines how to make a decent looking rubber bodysuit. It probably has to be custom molded for tons of $, but if anyone has any ideas for a cheap way to recreate this effect with decent results please help.

Question by jm838   |  last reply

Rubberbands for Guns

Thanks to many dedicated members of this community, this site is full of fantastic projectile weapons. However, many people, like myself, need tips of what brands or sizes of rubber bands we should use. I built many snipers and powerful guns, but alas, the rubber bands didn't do their jobs. This is what this forum is Intended to prevent. New Twist: Where to get SURGICAL rubber bands. Something not so easy to get.

Topic by King825   |  last reply

My crazy knex idea

I dont have pics but i tried this today. i got 10 rubber bands tied together and launched a red connector with a red rod out the back. this went about 700 FEET!!!! it is just an idea but the gun or launcher would have to be 10 ft long =p.

Topic by paperninja   |  last reply

K'NEX RBG Version 2

It's been a long while, but I have been thinking about my RBG all this time. During this hiatus I spent some time playing with knex guns that fired rods; however, they never came close to the fun I had with the RBGs.So, what resulted from those past experiments comes a slightly smaller and less bulkier RBG that is quite solid. I listened to the many suggestions and comments, and managed to solve a few quirks from the original design.What will be posted here on Instructables is not just the mechanism itself, but barrels, and other optional offerings to customize your RBG.In the mean time I'd like to add an honorable mention to Revtiedye for his take on the RBG.I hope your summer is going great(State-side) and stay tuned.

Topic by MrRadicalEd   |  last reply

What's the best type of rubber bands for knex guns? Answered

If there is no "best type", then what's better: putting on a lot of thin rubber bands or one thick one?

Question by Nexnaught   |  last reply

Which of viccie's slings shall i make?

I dunno which one of viccie.b1993 (full name) ratchet powered slingshots to make?! Please help MM8

Question by MegaMetal8   |  last reply

My new semi-auto RBG

This is my new semi-automatic, true trigger RBG. Normally nothing new. But this one can take twice the amount of rubberbands. Thanks to some creative use of a red gear ( I'm aware I didn't use an actual red gear, that's because I didn't have any. So I sliced the pegs of a yellow gear ) This actually started as a mod for Dsman1's RBG, but it turned out to be something different. It still uses the system that is somewhat his, of a red gear turning a blue gear. It can take 15+ rubberbands without tearing itself apart ( Nearly does though ;). My record is about 18 or 19 rubberbands on it. The reliability isn't 100%, because there is an uneven amount of pits in a red gear (33), which are divided by 4 stages. So it's hard to get a good pattern for the rubber bands to shoot of. This basicly means that sometimes it either won't shoot, or it will shoot 2 rubberbands at once. I don't know if this is a problem with an actual red gear though, since my altered yellow is far from perfect. Do you want me to post it, or is there no demand for a new RBG?

Topic by Dutchj   |  last reply

What can i do with lots of rubber tires?

I have come across a pile of deserted rubber tires.  I'm not sure what they were originally used for but they are fairly high quality. to be clear, these are just the rubber part, no rim.  There a bunch of different kinds but most are over 20 in. in diameter and the width is about 6 in. For what could i possibly use these?

Question by cavaliere   |  last reply

Is there agood knex gun that can shoot thick rubber bands(the one in the picture)?

I just want a gun that can shoot more of them. 1 trigger pull, 1 elastic relased, and then the next pull another on is released. I ve made the gnasher shotgun, but that one was not able to shoot these thick elastics.

Question by MarijnS95   |  last reply

Plane that flies & made only out of match boxes & rubber bands

I remember reading how to make  a  plane  with rubber bands when I was a kid. Could someone help me make one now with only paper or match boxes & rubber bands ?

Question by mytree 

Where can I get #64 rubber bands for my knex guns in Ontario, Canada? Answered

I need them for my knex guns. #64's seem to be the standard. I live in Ontario, Canada.

Question by Sting Teddy   |  last reply

Where can I get broccoli rubberbands? Answered

Well, since the AST Rifle seems to use so-called "broccoli bands", I want to know where to get them. And only show websites that can accept orders from The Netherlands, 'cause I live there.

Question by Miles Tails Prower   |  last reply

What is better? Answered

What is better? Fewer elastic bands pulled tighter or more elasting bands not as tight?

Question by Millawi Legend   |  last reply

are rbg guns harmless?

Are rubber band guns safe and harmless

Question by tomjack09   |  last reply

How would I go about making a basic gun out of K'NEX?

I am limited to only two boxes of knex and not too many rubber bands...

Question by Callum Snowden   |  last reply

what are the specs to making a fog ball cannon from a rubbish bin, fog machine rubber band and garbage bag? Answered

hey, a while ago in high school out teacher was showing uss tuff to do with the transferance of energy and stuff like that, what he brought into class one day was a rubbish bin, with a hole cut out bottom, and on the lid, there was a rubbish bag(the big black ones) , on top with a rubber band taped to it. basicaly the way it worked was, the band is taped to the bag,m when you pull the band back, you pull back the bag also, which pucks in air into the hole in the bottom of the bin,but at this time the hole is actually the top of the cannon, as thats where the air enters and comes out. now when the air is being sucked into the bin, our teacher also had a hose from a fog machine attached to it, which made the bin suck up air, now when he let the band go when the bin was full of air, a ball of air shot out, and the fog remained inside that air ball so we could see where the ball went, which was around 20 meters, anyway, the fog ball could nock over polystyrene cups from 20 meters. i want to know exactly how to build one of these as i cant really remember how they look like as i have forgotton, i was reminded of these once when i saw one being used on rollercaoster, in the minishow, elliot and the surfing scientist.

Question by oldmanbeefjerky   |  last reply

whats a good way to get more power from a knex gun without adding just rubber bands? Answered

I would like to know if the are ways to make knex guns have more power without have loads of rubber bands

Question by nutty guy   |  last reply

Which would be better for a makeshift crossbow, thick rubber or laminated bamboo?

     I was going to make this instructable on another sort of paper crossbow, because I promised that I would make a new version of it. But then I just decided to make a real crossbow. And so it got me thinking; should it be laminated bamboo or just a piece of rubber.      I know it will be very strong if I used laminated bamboo, but then again my hands are weak so I'm gonna' have to improvise a windlass for that. I'll have to do the same if I use really thick rubber. If you have any other suggestions for my ballista looking future crossbow, then bring it. I don't want to lose my hands while making and operating this thing.

Question by nutsandbolts_64   |  last reply

Is there and instructable for a projectile launcher make from knex that doesn't use rubber band propulsion?

Is there and instructable for a projectile launcher make from knex that doesn't use rubber band propulsion? I know that something like a catapult doesn't but i what something hand held? I would like a shotgun but a crossbow would do.

Question by seanroberts   |  last reply

how can i make my hk416 shoot white rods without millions of rubber bands? Answered

 i want to make my hk416 shoot white rods but i dont know how to do that without using thousands of rubber bands. pictures will follow soon

Question by knexpete   |  last reply


Hi everyboody so the knex evolution seems to have reached its end however i think i have some ideas, and if everybody understands there will be enough new challenges for these types of guns. so the idea is: the bullets will be charged with energy to make them fly, not a ram rod or mechanism or whatsoever, just a piece of ammo with a rubber band on it. find a way to stack them up. this will make it harder to make a proper magazine but it'll be worth it. for example a dark grey connector with a rubber band, piled to any size of rod, attach all the rubber band to the top of the magazine and make a mechanism not to put energy in the bullet, but to release them

Topic by mahmel   |  last reply

What should a k'nex Halo needler fire? Answered

Image of the needler HERE. So, what should it fire if it were to be made into a k'nex gun? I was thinking either rods, rubber bands, or special needles made of rods/connectors, but what do YOU think?

Question by Spycrab   |  last reply

"Giant Rail Gun o' Doom" - Knex Cannon (Un Finished) Entry To TNKIT

Well. Here it is. Thanks to running out of pieces and rubber bands, i haven't finished. Video'll be done when i get more peices. And more rubber bands. The trigger isn't complete. But it works.

Topic by ajleece   |  last reply

try this

Lego gunyou guys might like this, its a gun made out of lego and shots rubber bands. its pretty cool

Topic by evil_lemon   |  last reply

Knex Gun Range

Which knex gun gives me the best range with rubber bands as ammo: rods as ammo:

Topic by shahrukh1 

knex morter need help

I was wonder has any body made one because i was building one that folded into itself and had the abilty to fire things using fire works and rubber bands but the problem was when i but the rubber on in exploded its now completely destroyed so has any built one because i would some tips on builting the mortar

Topic by The ironman 

Pump action crossbow with a mag

Alright, I've had this idea for like forever and I finally got a working prototype yesterday. It has a pump with two prongs on the side which catch the rubber band bow as it is fired and then pulls it back. The trigger is a triangle shape so the rubber band can slide over the top, but still be caught on the back. The system has a few kinks, but mostly it just isn't that smooth. I hope to work them out and eventually be posting.

Topic by DRADIS   |  last reply

More precisions

The airplane i would like to build is: Rubber Band Powerd Aeroplane. So my question is : The plans with mesures are they in the PDF that we download?   Thank you MimiStar

Question by MimiStar   |  last reply

Knex War?

Hey guys! Sharir1701 here and, as most of you guys that knew me back when I was still around probably know, I've lost most of my interest in Knex. I do, however still come on the site ever so often to browse, comment and so on. I've noticed during my past couple of visits that there seems to be a "war", so to speak, raging on between some members of the community, regarding the effect of bulldozing a gun with rubber bands, as well as "how good" is the NAR. In this forum I am assuming you all have basic knowledge in Knex gun technology, are familiar with the stated guns and have a little bit of background in mechanical engineering. Moving on. You might know my opinion about the subject already, but I would like to state it once more as well as explain it better, so perhaps some people that disagree with me could understand my point of view. BUT, before I do that, I can't help but feel guilty for tossing the long burning logs into a small fire. About a month or two ago, in one of my visits, I posted a comment on one of Red's topics (or 'ibles, strike me dead for my memory) about my quite specific opinion about each and every one of the three guns in question in the said topic, the ZKAR, the NAR and the TR8. I said a few things about rubber bands and brute force vs. complexion and efficiency, and I may have started something unintentionally. That argument has been around since, if I recall correctly, 2009, but it hasn't been brought up again in a while. I feel like I made that happen and then I enraged a few more people by saying that "efficiency and good design beats brute force any day" (or something like that...). I'm not taking credit for starting this thing again, but rather I'm apologizing for sparking up an old and possibly pointless argument. Nonetheless, I will now explain my opinion on the subject and hopefully nobody gets mad at me for doing so, but if you have a valid counter argument, please state it below in an understandable and polite way. Thank you. If so, then, what is this whole thing even about? The "KI Crew", as I like to call them, have been very proud of their NAR and TR-n series guns for a few years now. The TR series I'll admit is very good, but I don't accept the "add as many rubber bands as possible" argument. Now, the NAR, personally, I dislike the gun. I have had nothing but bad range tests with it in the 3 times throughout the past 4 years that I've built it, and I've heard similar results from several people and some close friends. I highly doubt I was doing something wrong all THREE times, so don't bother to bring that up, please. The NAR is a gun designed for nothing else but being capable of withstanding great amounts of force and shooting a single round "the strongest a pin gun can shoot". How? Very simple - make a massively dense and very shock-proof body and then just add as many rubber bands as you can before your hands start bleeding. Now, let me explain, I'm saying 2 points here. First, the NAR is nothing special, just a strong structure with a simple connector barrel and a reinforced pin. We've seen it before, people. The claim that it's a good gun simply because you can put on as many bands as you want, pretty much, is, in my eyes, invalid. So I can make a bomb and just put as much explosives on it as I can afford, surely it'll be better than an atomic bomb... WRONG. It won't. Theoretically, even if it makes a bigger bang, it takes so much effort and it is so non-elegant that it loses it's point within itself. (Do not take this metaphor out of hand! You know what I mean). Second, and more importantly, I'm claiming that even if my first claim is wrong, if you look at the technical side of things you'll see that the very premise that adding more and more rubber bands to a gun will make it much stronger, is wrong in it's origins. I'm sure we all know this, but let me remind us all the physics of how a basic pin gun works. When the potential energy stored in the strained rubber bands, and rested on the cocked pin, is released, it accelerates the pin. The pin then proceeds to gain speed and it reaches three main milestones:  The initial strike of the bullet (The pin is already accelerated and is just touching the bullet, but the bullet is still). The point of equality, as I've dubbed it before (Just a few tiny fractions of a second after the initial strike, at this point the pin is ever so slightly slower than it was in the initial strike, but the bullet is now travelling at an equal speed as the pin, with a tiny gap between the two, meaning they aren't actually touching at this point) And finally, "the crash" (the bullet has left the barrel, the pin is at it's highest speed and is the most energetic as it pointlessly crashes into the back of the barrel losing and wasting all of it's remaining energy). In a world where you could use 100% of the acceleration of the pin and transfer it all into the bullet, adding more bands would indeed make a much stronger gun. BUT, that is impossible, in fact, it's no where near that. To put it all into a short sentence, the bullet accelerates and fires with a fraction of the energy released during the shot and to a certain limit, it is almost exactly the same amount of energy after a certain point. So, let's talk Maths. There is a direct correlation between the number of rubber bands on a gun and the amount of acceleration (and force) in the pin when fired. The pin's acceleration as a function of the number of rubber bands on the gun is in the order of magnitude of y=x. That's true, and that is where the misguided claim in question comes from. However, if we take a look at the graph of a bullet's acceleration as a function of the number of rubber bands on the gun, we can conclude, according to the above explanation, that the function is in the order of magnitude of y=sqrt(x). That means that up to a certain pivot, which I claim is, on average, around the 2-3 rubber band mark, adding more rubber bands does in fact produce a drastically stronger shot, but past that point, adding more rubber bands adds more brute force, yes, but it makes the shot stronger only just slightly, and by an increasingly smaller amount the more bands you put on it. BUT, and this is the big BUUT, the graph of the force required to cock the gun as a function of the number of bands on the gun is, again, in an order of magnitude of y=x. In conclusion, up to a certain, quite low point, adding more rubber bands will give you a drastically stronger shot without stressing the gun too much and without making the pull incredibly hard. However, past that point, adding more rubber bands adds an insignificant amount of power to the gun while introducing a whole lot more difficulty in operating it, resulting in an overall, worse gun. That is why I claim that a gun built around the sole concept of being capable to handle a lot of rubber bands is a nice concept, but is much worse than a gun built around efficiency (meaning you try to invest as much of the potential energy of the pin into the bullet by making a more efficient layout and a smarter usage of the forces in play). If you got this far, thank you for reading my article, and I hope this will put an end to this silly argument, but knowing how people's feelings work and how male ego and testosterone works, I bet it's far from it. Happy Knexing everybody ;)

Topic by Sharir1701   |  last reply