What is Brim? Understanding the Meaning and Uses of Brim

Definition

A brim in additive manufacturing, particularly in 3D printing, refers to a layer of material that is printed around the base of a 3D printed object. Unlike a raft, which is a separate structure printed underneath the object, a brim is directly attached to the edges of the object’s first layer. The primary purpose of a brim is to improve bed adhesion and reduce warping by increasing the surface area in contact with the build platform.

Explain Brim like I’m 5

Think of a brim like the wide edge of a hat that goes all the way around. When you’re making a toy with a 3D printer, the brim helps the toy stick to the table better so it doesn’t move or get messed up while it’s being made.

Why does this matter?

Brims are crucial in 3D printing because they help ensure that the first layer of the print adheres well to the build platform. This is especially important for objects with small bases or intricate designs that are prone to warping or lifting off the platform. By improving adhesion, brims can lead to higher print success rates and better overall print quality.

Real Talk

While brims are great for improving bed adhesion and reducing warping, they do have some downsides. They can be time-consuming to remove and may leave marks on the base of the printed object, requiring additional post-processing. Also, using a brim means more material is used, which can slightly increase the cost and print time. Despite these drawbacks, brims are a simple and effective solution for many common 3D printing issues, especially for beginners or when printing challenging designs.