Brim Width Calculator — Optimal Brim Size

For PLA, about 5mm is usually enough — at a 0.4mm line width that rounds up to 13 concentric lines, so the slicer prints a 5.2mm brim. For PETG use 7-8mm. For ABS or Nylon, 10-15mm provides better hold against warping. Wider brims add more contact area but take longer to remove.

Brims are only one layer thick, so they use very little material — typically less than 1g for a small to medium part. They are far more material-efficient than rafts.

Peel the brim off by hand while the part is still slightly warm. Any remaining edges can be cleaned with a craft knife or light sanding. A well-tuned brim separates very cleanly.

A skirt does not touch the part — it only primes the nozzle. A brim attaches to the part edge and adds contact area for adhesion. Use a brim when adhesion is a concern.