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* Document automatic pressure-advance calibration FF_PA_CALIBRATE/FF_PA_PROBE and HelixScreen's calibration-screen integration shipped without owner/experienced-user documentation -- only the reverse-engineering notes covered it. Adds a table row and full section to how-calibration-works.md, and links back to it from the notes page. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0147AQiPYgtafuy1x5NjqJuy * Add a simple pressure-advance calibration page Owner-facing procedure alongside XYZ tool calibration and bed mesh -- FF_PA_CALIBRATE with a temp and tool number, what the output means, and how to save it. how-calibration-works.md's mechanism section now links here instead of duplicating the command walkthrough. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0147AQiPYgtafuy1x5NjqJuy * Point pressure-advance results at the slicer, not printer.cfg PA is a filament property, not a printer one -- a value baked into printer.cfg is wrong the moment you switch material. Recommend the slicer's per-filament Pressure Advance field instead. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0147AQiPYgtafuy1x5NjqJuy * Correct pressure-advance page: there is no factory value Unlike tool offsets and bed mesh, PA calibration doesn't import a factory number on first boot -- FF_PA_CALIBRATE only measures and reports one. Say that instead of implying it's pre-populated. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0147AQiPYgtafuy1x5NjqJuy --------- Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>