From 82ef101ed5220280fb11c289790f869b816746d7 Mon Sep 17 00:00:00 2001
From: Scott Lahteine <sourcetree@thinkyhead.com>
Date: Wed, 30 Mar 2016 16:41:16 -0700
Subject: [PATCH] Deploy & Stow in G29 for Delta + Z Servo Endstop

---
 Marlin/Conditionals.h  | 2 +-
 Marlin/Marlin_main.cpp | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/Marlin/Conditionals.h b/Marlin/Conditionals.h
index 66861b62f1..08c39d4e2b 100644
--- a/Marlin/Conditionals.h
+++ b/Marlin/Conditionals.h
@@ -339,7 +339,7 @@
     #define MAX_PROBE_Y (min(Y_MAX_POS, Y_MAX_POS + Y_PROBE_OFFSET_FROM_EXTRUDER))
   #endif
 
-  #define SERVO_LEVELING (defined(AUTO_BED_LEVELING_FEATURE) && defined(Z_ENDSTOP_SERVO_NR))
+  #define SERVO_LEVELING (ENABLED(AUTO_BED_LEVELING_FEATURE) && defined(Z_ENDSTOP_SERVO_NR) && Z_ENDSTOP_SERVO_NR >= 0)
 
   /**
    * Sled Options
diff --git a/Marlin/Marlin_main.cpp b/Marlin/Marlin_main.cpp
index a7618eaf7d..f789e2b88e 100644
--- a/Marlin/Marlin_main.cpp
+++ b/Marlin/Marlin_main.cpp
@@ -3074,7 +3074,7 @@ inline void gcode_G28() {
 
     #if ENABLED(Z_PROBE_SLED)
       dock_sled(false); // engage (un-dock) the Z probe
-    #elif ENABLED(Z_PROBE_ALLEN_KEY) //|| SERVO_LEVELING
+    #elif ENABLED(Z_PROBE_ALLEN_KEY) || (ENABLED(DELTA) && SERVO_LEVELING)
       deploy_z_probe();
     #endif
 
@@ -3342,7 +3342,7 @@ inline void gcode_G28() {
 
     #if ENABLED(DELTA)
       // Allen Key Probe for Delta
-      #if ENABLED(Z_PROBE_ALLEN_KEY)
+      #if ENABLED(Z_PROBE_ALLEN_KEY) || SERVO_LEVELING
         stow_z_probe();
       #elif Z_RAISE_AFTER_PROBING > 0
         raise_z_after_probing(); // ???