@rulecad/rules

Researched facts for designing printed parts, as open data (CC0, public domain). Every value says what it is, where it comes from and when it was checked, so a design built on it can be traced and corrected.

"bed": { "value": 256, "unit": "mm", "rule": "Build volume is 256 × 256 × 256 mm", "kind": "spec",
         "source": "https://…", "checked": "2026-10-11" }

| Set | What | Values | |---|---|---| | x1c | Bambu Lab X1 Carbon: bed, line width, layer, overhang, bridges, fits and hole compensation | 11 | | mx | Cherry MX switches: plate cut-out, stem, housing, travel, key pitch | 29 | | oem | OEM keycap profile: heights and top tilt per row (from KeyV2) | 12 | | m2 | M2 heat-set inserts and screws | 5 | | pico | Raspberry Pi Pico: outline, headers, the GPIO on each pin | 18 | | promicro | Pro Micro controller | 9 | | sod123 | SOD-123 diode footprint | 3 | | xiao | Seeed Studio XIAO modules: outline, headers, the pin on each pad | 8 | | qwiic | Qwiic / STEMMA QT sockets (JST SH, 4 pins): land pattern and pinout | 10 | | jstph | JST PH (2.0 mm) battery connector | 3 | | jlcpcb | JLCPCB's limits for two-layer boards | 10 | | wiring | Room for hand wiring | 1 |

kind says how far to trust a value: spec (a datasheet or manufacturer), community (a widely used figure, such as KiCad's library or KeyV2), default (a setting that works), derived (read off someone else's model with cad measure: check it against the real thing, and see its licence), or estimate (nobody has published it: measure it and correct it). Use them with @rulecad/variables (uses: ['x1c'], then x1c.line * 3 in any expression), or read the JSON from anywhere.

Corrections are the most useful contribution. If you measured something, use the "Correct a rule" issue form on GitHub, or open a pull request with the value, "kind": "measured", how you measured it, and the date.