Picture of Knex Automated Door Closing Device
This is the one and only Knex door closer. I admit it is not the best but it works fine. You can even close the door from far away by adding a string to the pin.

Step 1: The Body

This is the main part. It holds the counterweight. It is possible to make the tower 1 gray rod higher to shut the door even farther.
I Know a lot of the pictures are out of order but please try your best. If you have questions feel free to ask.
jman123454 years ago
will "c" batteries work 2 =)
Electroinnovation (author)  jman123454 years ago
sure just not as well
joey994 years ago
you could add a trip wire and make your room pitch black so when someone walks in the door closes on them!!!
halo12326 years ago
As soon as I finish building it, the door slams open and it goes SMASH!!
tphan975 years ago
Please take more picture
FrOnTLiNe6 years ago
Q: Why would you want a door closer?
Hmm. "Why would you want a door closer?" PROBABLY TO CLOSE THE DOOR! Not meaning to be rude, just pointing out a "duh" answer to your question.
halo99 Foaly75 years ago
he meant to say 'why would you need a door closer when you could do it yourself' your so dumb,you think you know everything...wow your so immature...
Foaly7 halo995 years ago
Dude, does be nice policy mean nothing to you. Plus, I said it was a "duh answer".
Foaly7 Foaly75 years ago
Oops, I meant "Dude, does BE NICE POLICY mean nothing to you?".
Electroinnovation (author)  FrOnTLiNe6 years ago
A: Why do you have to be so critical. I was bored so I built it.
I was sorta kidding, I kind of thought it was pointless.
Asday FrOnTLiNe6 years ago
Well, it closes doors, and doors are there for opening and closing, so no. No it is not pointless. Not in the least. I think what you mean, is its only value is hack value. I'd agree with that.
FrOnTLiNe Asday6 years ago
well mybe everyone who is saying that it has a purpose r jst fat lards who sit around n play xbox all day n cantt get up n close a friken door.
Asday FrOnTLiNe6 years ago
Way to generalise there. Millionaires who have their own gyms, and are in the peak of physical fitness have automatically closing doors. Gonna call them fat? If you don't like the model, don't build it, and don't judge others. You don't have the right.
FrOnTLiNe Asday5 years ago
They hav money n work out. Oh ya i didnt mean to offend u when i said FAT!
A: I think it is for people that are too lazy to get out of their chairs and close the door.
Whaleman6 years ago
Sorry, I already got used to closing the door when I go into a room.
Electroinnovation (author)  Whaleman6 years ago
Yes but watch this new video. You can close the door from over 15 feet away like magic.
But why? Why would I do such a thing? Hell, I cannot do such a thing. My room is only ten feet long.
Electroinnovation (author)  Whaleman6 years ago
Than you can set it up as a tripwire. Use your imagination.
PKM6 years ago
Something useful that isn't a gun, made from K'nex! K'zomg! It does look a bit like a trip wire though...
arrow shot PKM6 years ago
theres a bunch o' stuff thats useful made of knex :D
Electroinnovation (author)  PKM6 years ago
Yes I saw that before. If you put a yellow rod on the line the door still closes and you cant trip over it.
arrow shot6 years ago
i dont close msot doors, and this wont fit in my bathroom...and what exactly is this, jsut something that pulls a string?
Katarukito6 years ago
i made a light turn off thing before
Doctor What6 years ago
Yay! Something besides a gun! Plus one man card.
I'm taking away one of your man cards for enjoying something that's not a gun!