From d07a913f211545f086bc1cb1e166dd53b0aab789 Mon Sep 17 00:00:00 2001
From: Scott Lahteine <sourcetree@thinkyhead.com>
Date: Fri, 2 Sep 2016 02:06:17 -0500
Subject: [PATCH] Tweak to stepper advance e_steps update

---
 Marlin/stepper.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Marlin/stepper.cpp b/Marlin/stepper.cpp
index 51459602f0..364e66d1b6 100644
--- a/Marlin/stepper.cpp
+++ b/Marlin/stepper.cpp
@@ -426,7 +426,7 @@ void Stepper::isr() {
           counter_E -= current_block->step_event_count;
           #if DISABLED(MIXING_EXTRUDER)
             // Don't step E here for mixing extruder
-            e_steps[TOOL_E_INDEX] += motor_direction(E_AXIS) ? -1 : 1;
+            motor_direction(E_AXIS) ? --e_steps[TOOL_E_INDEX] : ++e_steps[TOOL_E_INDEX];
           #endif
         }