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Taken from the answer provided by @EricJohnson,

When should I use a raft, and when should I use a brim? What advantages does each have over the other?

Raft enter image description here

Brim enter image description here

1 Answer 1

A raft helps when the part has few points of contact with the print bed, and doesn't therefore adhere well at points within and without the part.

A brim helps when the part doesn't adhere well around the perimeter of the part.

There are very rare situations where you'll need both, but typically you'll only use one or the other.