From 8fa420991642855cd733d211a94a97a96531cbf9 Mon Sep 17 00:00:00 2001
From: Scott Lahteine <sourcetree@thinkyhead.com>
Date: Tue, 4 Apr 2017 20:16:21 -0500
Subject: [PATCH] Movement/adjustment should be reverse of probe offset change

---
 Marlin/Marlin_main.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Marlin/Marlin_main.cpp b/Marlin/Marlin_main.cpp
index 337c7f7872..6f593812ef 100644
--- a/Marlin/Marlin_main.cpp
+++ b/Marlin/Marlin_main.cpp
@@ -7984,7 +7984,7 @@ inline void gcode_M503() {
           if (diff) {
             for (uint8_t x = 0; x < GRID_MAX_POINTS_X; x++)
               for (uint8_t y = 0; y < GRID_MAX_POINTS_Y; y++)
-                bed_level_grid[x][y] += diff;
+                bed_level_grid[x][y] -= diff;
           }
           #if ENABLED(ABL_BILINEAR_SUBDIVISION)
             bed_level_virt_interpolate();
@@ -7993,7 +7993,7 @@ inline void gcode_M503() {
 
         #if ENABLED(BABYSTEPPING)
           if (planner.abl_enabled)
-            thermalManager.babystep_axis(Z_AXIS, lround((value - zprobe_zoffset) * planner.axis_steps_per_mm[Z_AXIS]));
+            thermalManager.babystep_axis(Z_AXIS, lround(-(value - zprobe_zoffset) * planner.axis_steps_per_mm[Z_AXIS]));
         #endif
 
         zprobe_zoffset = value;