Scad Library Bosl2

SCAD Library BOSL2 Skill

Use BOSL2 as the preferred general-purpose OpenSCAD quality library when include <BOSL2/std.scad> is listed in the runtime prompt.

Import

Place this line near the top of scad_source, before modules that call BOSL2 helpers:

include <BOSL2/std.scad>

Do not use BOSL2 unless the runtime prompt lists it as available.

Best Uses

• Use cuboid() instead of raw cube() for rounded or chamfered rectangular solids.
• Use cyl() instead of raw cylinder() when a part needs chamfers, rounding, or cleaner alignment.
• Use BOSL2 transforms and anchors to place features relative to faces instead of hard-coding fragile offsets.
• Use masks/cutters for bevels, chamfers, screw seats, countersinks, and visually readable edges.
• Use BOSL2 path and offset helpers for swept or rounded profiles when the geometry is fundamentally sketch-based.
• Use BOSL2 gears or screws only when the exact helper signature is known; otherwise prefer MCAD for gears and threadlib/threads.scad for threaded connectors.

Generation Pattern

Keep editable numeric values as top-level assignments before module declarations. Use BOSL2 inside reusable modules:

include <BOSL2/std.scad>

/* [Dimensions] */
width = 80;       // min: 20 max: 200 step: 1
depth = 50;       // min: 20 max: 200 step: 1
height = 24;      // min: 8 max: 120 step: 1
corner_radius = 4; // min: 0 max: 16 step: 0.5

module body() {
  cuboid([width, depth, height], rounding=corner_radius, edges="Z", anchor=CENTER);
}

body();

Quality Rules

• Prefer real rounded primitives over minkowski() for simple boxes and cylinders.
• Keep radii smaller than half of the smallest adjacent dimension.
• Avoid decorative rounding that weakens retaining lips, snap tabs, screw bosses, or mating surfaces.
• For printable parts, keep wall thickness and clearances explicit as parameters.
• Use $fn sparingly; rely on $fa and $fs for curves when practical.

Avoid

• Do not copy BOSL2 source into generated SCAD.
• Do not use BOSL2 helpers as hidden parameter stores.
• Do not mix anchor-heavy BOSL2 placement with unrelated hard-coded transforms in the same feature unless the coordinate frame is obvious.
• Do not call obscure BOSL2 functions unless the signature is certain.