Brim Settings

What is a Brim?

A brim is a single layer of material printed around and attached to the base of your model. It increases the surface area touching the bed, improving adhesion and preventing corners from lifting (warping). After printing, the brim is peeled or cut away.

Brim Type

Parameter: brim_type
Options: No brim, Outer brim only, Inner brim only, Outer and inner brim
Description: Where to place the brim relative to the model.

Type	Best For
Outer brim only	Most common, general adhesion
Inner brim only	Parts with holes, inner adhesion
Outer and inner	Maximum adhesion, complex shapes

Brim Width

Parameter: brim_width
Unit: mm
Default: 5mm
Description: Width of the brim extending from the model. Wider brim = more adhesion.

Brim-Object Gap

Parameter: brim_separation
Unit: mm
Default: 0mm
Description: Gap between brim and object. Small gap (0.1mm) makes removal easier while maintaining adhesion.

Brim Ears

Parameter: brim_ears
Type: Boolean
Description: Only add brim at sharp corners where warping is most likely, not around the entire model.

Brim Ears Max Angle

Parameter: brim_ears_max_angle
Unit: Degrees (°)
Default: 125°
Description: Maximum corner angle to receive brim ears. Sharper corners below this angle get brims.

When to Use a Brim

Scenario	Brim Needed?	Recommended Width
Small base area	Yes	5-10mm
Sharp corners (ABS)	Yes	8-15mm or ears
Tall thin models	Yes	10-15mm
PLA on textured PEI	Usually no	3-5mm if needed
PETG	Rarely	3-5mm if needed

Brim Removal Tips

Add separation: 0.1-0.15mm gap makes peeling much easier
Use a knife: Score along the model edge first for clean removal
Deburring tool: Clean up any remaining brim material
Sand if needed: Light sanding removes any brim remnants

Pro Tip: Use "Brim Ears" for rectangular parts with sharp corners. It provides adhesion where needed while minimizing cleanup.