These are also ideal representational dimensions since we're not going to manufacture these. Basic geometric bricks are made of only these dimensions. In the CAD world it doesn't really matter.
Some people refer to the 'stud' and others refer to 'LU' (LEGO unit), with even more debate on what a LU is. There's some debate about what a 'unit is'. Both the shape number and color/brick number can be searched in BrickLink. That is the number that they inventory by. That number is the color code combined with shape number. If you look in the back of the Build Instructions (those that have a parts list) you'll see a longer number. This is a number that corresponds to the shape only, as many colors can be cast in the same mold. I will refer to BrickLink ( but many others use similar methods:Īlmost every piece has a part number molded into the part, usually in the bottom 'female' side cavity, and usually consists of 4 to 6 digits (go ahead, look at your own bricks). Standard parts consist of square, circular, and angled blocks - regular geometric blocks. Most 'standard' parts can be created using only simple math. I get a lot of questions about how I create LEGO parts.
