# BelfrySCAD/BOSL2

The Belfry OpenScad Library, v2.0.  An OpenSCAD library of shapes, masks, and manipulators to make working with OpenSCAD easier.  BETA

Repository: https://github.com/BelfrySCAD/BOSL2
Canonical: https://ross.abutalabs.com/products/bosl2
Homepage: https://github.com/BelfrySCAD/BOSL2/wiki
Language: OpenSCAD
License: BSD-2-Clause
License Family: permissive
Topics: scad, openscad-library, openscad, openscad-framework
Last push: 2026-08-17T07:57:50+00:00

## Health v2 (maintenance only)
Score: 99/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 98, release rhythm 99, longevity 100
- inputs: {"age_days": 2694, "days_push": 16, "days_rel": 10, "gap_med": 7, "n_releases_24m": 18}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2330, forks 204 (observed 2026-08-28T04:06:37.703908+00:00)

## What it is
BOSL2 is a large OpenSCAD library providing shapes, masks, attachments, rounding/filleting tools, math utilities, and shorthands to simplify parametric 3D modeling. It requires OpenSCAD 2021.01 or later and is explicitly labeled beta code.

## Use cases
- build parametric 3D models in OpenSCAD more easily
- position model parts relative to each other with attachments
- round edges and fillet corners of 3D shapes
- sweep profiles along paths to create complex objects
- subtract mask shapes from object edges
- write shorter, more readable OpenSCAD code with shorthands

## When to choose
- you model in OpenSCAD and want easier positioning and composition of parts
- you need rounding, filleting, or edge masks that are hard in native OpenSCAD
- you want a comprehensive toolkit of shapes, transforms, and math helpers for CAD scripting

## When to avoid
- you use BOSLv1 code, which is incompatible with BOSL2
- you need a stable, non-beta library and cannot tolerate reorganization
- you don't use OpenSCAD or work outside parametric CAD scripting

## Facets
- artifact type: library
- maturity: active
- function: graphics, simulation, math, developer-tools
- domain: graphics, developer-tools, cross-platform
- platform: cross-platform, cli
- tags: openscad, cad, 3d-modeling, parametric-design, geometry, attachment-system, rounding, filleting, game-development

## Member repositories
- BelfrySCAD/BOSL2 (main) score 99

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:37.703908+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:38:01.009688+00:00, confidence not recorded.
  - readme: https://github.com/BelfrySCAD/BOSL2 (fetched 2026-08-28T04:06:37.703908+00:00, sha 11ec0596065d)
  - homepage: https://github.com/BelfrySCAD/BOSL2/wiki (fetched 2026-08-29T10:18:23.490504+00:00, sha c7ce11a5f9f5)
- Data as of 2026-08-30T08:39:29.467469+00:00.