From 770adcfa1589a15746bc1ae8f26071ce5cd7ebbb Mon Sep 17 00:00:00 2001
From: Jason Smith <jason.inet@gmail.com>
Date: Sun, 10 Nov 2019 14:21:20 -0800
Subject: [PATCH] Raise Z before homing X/Y on unknown Z (#15859)
---
Marlin/src/gcode/calibrate/G28.cpp | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/Marlin/src/gcode/calibrate/G28.cpp b/Marlin/src/gcode/calibrate/G28.cpp
index 63408515fb..9ce7938420 100644
--- a/Marlin/src/gcode/calibrate/G28.cpp
+++ b/Marlin/src/gcode/calibrate/G28.cpp
@@ -308,7 +308,7 @@ void GcodeSuite::G28(const bool always_home_all) {
if (z_homing_height && (doX || doY)) {
// Raise Z before homing any other axes and z is not already high enough (never lower z)
- destination.z = z_homing_height;
+ destination.z = z_homing_height + (TEST(axis_known_position, Z_AXIS) ? 0.0f : current_position.z);
if (destination.z > current_position.z) {
if (DEBUGGING(LEVELING)) DEBUG_ECHOLNPAIR("Raise Z (before homing) to ", destination.z);
do_blocking_move_to_z(destination.z);
--
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