Picture of Lego Mousetrap Car
Do you need to make a Mousetrap car for science class? Do you have some Lego's around the house that aren't being used? Do you have 10 minutes of free time?

Well this simple design will leave you with a quick accelerating, compact mousetrap car that will beat the competition. With this design I ended up getting 1st place in acceleration, and 6th in distance.

Step 1: Parts You Need

Picture of Parts You Need
Parts you will need:

Duct Tape
Fishing string
(x4) Small Lego Technic tires
(x2) Skinny gray spacers
(x2) Fat gray spacers
(x2) 1x16 bricks with holes in them (the yellow ones in the picture)
(x2) 1x6 plates
(x2) 1x8 plates
(x1) 2x6 plate
(x2) 1x4 plates
(x4) 4x6 plates
(x1) 10 long axle (about how many brick dots long it is)
(x1) 8 long axle
(x1) Red K'nex piece
(x1) Mouse Trap (duh...)
yea1 month ago

this sucks m8

yea1 month ago

this sucks so bad eh

yea1 month ago

this sucks

yea1 month ago

this sucks

Z.Backas4 years ago
Thanks for your design! I won first place in distance and speed with it in my class! I added a longer arm for distance, and bigger wheels in the back too.
yea Z.Backas1 month ago

uh how do u make the car go???
ive made the car but dont know how to make it actually drive...


thenks for da design! @_@ ;]

Adidas13984 months ago
How Long does the string have to be?
Col-Singleton5 months ago

Do you need to use fishing line? I really need to know.

Vynash6 years ago
HAHAHA Awesome! 5*s!
jackieg1 Vynash9 months ago

This is awesome and i love it

LivyT11 months ago

Can you tell me what's wrong? I have 1x14 hole bricks and the mousetrap is a little too big and it goes a little bit over the place where you wind the string is that ok?

asdfghjkl811 months ago

i cant wind it up!

that could realy haelp my mouse problem

jonesy10ftw5 years ago
 what kind of wheels did you use, bc all my lego wheels fall off the axis?
LegoBrickMaster7 (author)  jonesy10ftw5 years ago
The wheels are fairly standard Technic wheels.

Here's a link to a set that uses the same kind of wheels and axles. (The website is used for piece inventory.)

Also, if you don't have the right wheels, you could always pick up a cheap Technic set that has the right ones.
i need fishing rod and knex!!!!!!!!!!!!!!!!1
um.....do you have to use a fishing rod and i think it is better if there is a video of how to build it.
REDefiant5 years ago


Nez19935 years ago
we have not made this yet, but i guess it looks cool enough to give it a try.
bloggingman6 years ago
that's a really easy way to make a mouse trap car... plus using a lego will help reduce weight... which is good for long distance cars and fast cars....
whats with the weird thing ehn you click on mouse trap car
ouuhh this looks sexy
senario 1586 years ago