Add UNKNOWN_Z_NO_RAISE option
With this option enabled, Z won't ever be raised until after `G28` has been completed, and it won't raise if Z becomes unknown. This is good for machines whose beds fall when Z is powered off.
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@ -804,6 +804,8 @@
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//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
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//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
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//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
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// Be sure you have this distance over your Z_MAX_POS in case.
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@ -221,9 +221,15 @@ void GcodeSuite::G28(const bool always_home_all) {
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#endif
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if (home_all || homeX || homeY) {
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#if ENABLED(UNKNOWN_Z_NO_RAISE)
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const float z_homing_height = axis_known_position[Z_AXIS] ? Z_HOMING_HEIGHT : 0;
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#else
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constexpr float z_homing_height = Z_HOMING_HEIGHT;
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#endif
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if (z_homing_height && (home_all || homeX || homeY)) {
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// Raise Z before homing any other axes and z is not already high enough (never lower z)
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destination[Z_AXIS] = Z_HOMING_HEIGHT;
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destination[Z_AXIS] = z_homing_height;
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if (destination[Z_AXIS] > current_position[Z_AXIS]) {
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#if ENABLED(DEBUG_LEVELING_FEATURE)
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@ -378,13 +378,21 @@ bool set_probe_deployed(const bool deploy) {
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// Make room for probe to deploy (or stow)
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// Fix-mounted probe should only raise for deploy
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if (
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#if ENABLED(FIX_MOUNTED_PROBE)
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deploy
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#else
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true
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#endif
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) do_probe_raise(max(Z_CLEARANCE_BETWEEN_PROBES, Z_CLEARANCE_DEPLOY_PROBE));
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#if ENABLED(FIX_MOUNTED_PROBE)
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const bool deploy_stow_condition = deploy;
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#else
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constexpr bool deploy_stow_condition = true;
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#endif
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// For beds that fall when Z is powered off only raise for trusted Z
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#if ENABLED(UNKNOWN_Z_NO_RAISE)
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const bool unknown_condition = axis_known_position[Z_AXIS];
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#else
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constexpr float unknown_condition = true;
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#endif
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if (deploy_stow_condition && unknown_condition)
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do_probe_raise(max(Z_CLEARANCE_BETWEEN_PROBES, Z_CLEARANCE_DEPLOY_PROBE));
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#if ENABLED(Z_PROBE_SLED) || ENABLED(Z_PROBE_ALLEN_KEY)
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#if ENABLED(Z_PROBE_SLED)
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