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Feature/start print from z #28458

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Feature/start print from z #28458

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32e9a80
Add START_PRINT_FROM_Z: manual Z-skip start of SD prints
ststefanov-ha Jun 2, 2026
75309ac
Document M1005 in gcode.h header listing
ststefanov-ha Jun 2, 2026
3c84512
Improve START_PRINT_FROM_Z (LCD UX, progress, no-PLR resume)
ststefanov-ha Jun 11, 2026
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22 changes: 22 additions & 0 deletions Marlin/Configuration_adv.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1907,6 +1907,28 @@
#endif
#endif

/**
* Manual "Start Print From Z" — start an SD print at a chosen Z height.
*
* Adds an LCD submenu "Print from Z..." that lets the user set a target Z
* before printing a file. When the print is started, Marlin pre-scans the
* G-code, simulating the machine state (X/Y/Z/E, units, abs/rel modes,
* G92, target temperatures, fan speeds, active tool) without performing
* any motion, until a move brings Z >= target. Marlin then heats up,
* homes XY, lifts Z to the target, restores the E counter, and resumes
* the SD print from that byte offset.
*
* Self-contained — does NOT require POWER_LOSS_RECOVERY.
*
* Useful as a manual replacement for power-loss recovery when no recovery
* file was saved (e.g. crash, manual abort, swapped SD card).
*/
//#define START_PRINT_FROM_Z
#if ENABLED(START_PRINT_FROM_Z)
#define START_PRINT_FROM_Z_MAX 1000.0f // (mm) Max selectable Z height
//#define START_PRINT_FROM_Z_DEBUG // Verbose serial output during scan
#endif

/**
* Sort SD file listings in alphabetical order.
*
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