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Oleksandr Shyshatskyi 8baadde8b4 The residual guard stops rejecting merely mediocre machines
max_residual defaulted to 0.05, which caught circle-fit centre errors of
about 0.1 mm. That is a quality gate, not a safety one, and the stock
firmware has no residual check at all -- so every abort it produced was an
abort the machine's own firmware would have sailed through. A user hit
0.068 on a real Creator 5 and the calibration stopped with nothing saved.

0.5 keeps what the guard is actually for: one point off by ~2 mm, a centre
error of ~1 mm, the mm-scale mis-trigger that ends with a nozzle in the
plate. What it gives up is being told about a sloppy-but-usable pass, and
the numbers to notice that yourself -- max residual, radius, and the four
points -- are printed on every pass either way. max_residual: 0.05 in
[ff_tool_offset] restores the old behaviour.

Docs follow the number: the error table in calibration.md, the safety
notes and commented default in ff-tool-offset.cfg, and note 45.
2026-08-26 22:51:17 +03:00
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