LEGO Brick Dimensions and Measurements

The LEGO bricks are precisely designed to fit perfectly together. There is a 0.2mm gap between bricks next to each other. The gap between two bricks stacked on top of each depends on how careful to pressed them down. Of course there are several websites that show you the exact measurements, but some of them were a bit confusing or even broken.

LEGO 2×4 Brick (3001)

I enjoy working in 3D so I used Fusion 360 to create this technical drawing of the LEGO Brick. You can download the model over at GrabCAD and the PDF file from here.

lego-2×4-brick-dimensions-measurements-3001

LEGO 2×4 Plate (3020)

This plate is 1/3 of the height of a normal brick. You can download the model at GrabCAD and the the PDF file from here.

lego-2×4-plate-dimensions-measurements-3020

LEGO 1×4 Technic Brick (3701)

The technic bricks have a hole in the side for pin connectors or axles to go through. I had to cut open a brick to get the exact design of the inside tubes right. The model is available at GrabCAD and the PDF file from here.

lego-1×4-technic-brick-dimensions-measurements-3701

Ultra compact LEGO compatible ball bearing

It is still difficult to rotate heavy objects with LEGO and hence I designed an ultra compact LEGO compatible ball bearing. it is only 6 studs wide and two studs high. I also added two lift arms. You can put a worm wheel in there to rotate the turn table. The 3D model is available for download from Autodesk. You may need Fusion 360 to work with the model.

This ball bearing is so small that you need a very high resolution printer to get good results. Some of the wall thicknesses could be to small to get printed on low quality printers. I will now be working on a slightly bigger version that can be printed on more affordable printers.

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Lego CD-ROM

This CD-Rom contains computer animated building instruction for the Miami Beach Patrol Model. The instructions are divided into steps. A movie shows the process and an element list the needed bricks for each step. The user controls the action from a panel. Here are some example QuickTime movies (320×240 pixels), click on the thumbnail pictures to play.

The Car in the wireframe view (click to enlarge)
front
Front view
side
Side view
top
Top view
Animations (click to play)
The steering construction
The steering construction
A wild camera transition
A wild camera transition
Sub component assembly
Sub component assembly
The steering wheel
The steering wheel
The tires
The tires
The driver
The driver
Other interesting pictures (click to enlarge)
Full Rendering
Full Rendering
CD-Rom Interface
CD-Rom Interface