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Brim
Also known as: brim · faldon · faldón · ala de adherencia · borde de adhesion
Short definition
A brim is a flat single-layer ring the slicer prints attached to the part's outline to increase its contact area with the bed.
Full definition
It does two jobs: holding down parts with a small footprint, which pop off at the slightest knock from the head, and holding down the corners of large parts prone to warping. It peels off by hand or with a spatula afterwards, leaving a small burr you trim with a knife. Prusa recommends a brim of 3 mm or more to improve edge and corner adhesion on large ASA parts, and 4 mm for polycarbonate parts larger than 5 cm. Unlike a raft, a brim does not sit under the part but around it, so it does not affect the first-layer finish.
Related terms
- RaftA raft is a multi-layer platform printed first, on top of which the part is built, instead of printing directly onto the bed.
- WarpingWarping is the deformation where the part's corners lift off the bed because the material contracts unevenly as it cools.
- First layerThe first layer is the one deposited directly onto the bed and it determines whether the part stays put for the whole print.
Software
Updated
Sources
- [1]ASA | Prusa Knowledge BasePrusa Research · Manufacturer · accessed July 27, 2026