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NebulaOS's own work on this fork lives entirely in klippy/extras/ — the prtouch_*.py,
z_compensate.py, tmcstatus.py family and their test_*.py counterparts. See
NebulaOS Changes for exactly what's inherited-but-not-NebulaOS's vs. genuinely
added.
Design rationale for PRTouch/Z-compensation lives alongside the code as DESIGN.md/ANALYSIS.md
in klippy/extras/ (referenced directly in the modules' own header comments) — read those before
changing probe/compensation behavior; several non-obvious decisions (e.g. why Z-compensation
defaults to a live SET_GCODE_OFFSET instead of SAVE_CONFIG) are explained there, not just in
code comments.
Real hardware quirks worth knowing before touching this code: the load cell is bed-mounted, not toolhead-mounted (test by pressing the bed, not the nozzle) — see PRTouch.
See also: Testing, Integration with NebulaOS-firmware.