From 65d0f32f821782a9507c6432c585389685719790 Mon Sep 17 00:00:00 2001
From: Bob-the-Kuhn <bob.kuhn@att.net>
Date: Fri, 8 Dec 2017 18:14:27 -0600
Subject: [PATCH] divide only when required

---
 Marlin/src/module/planner.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Marlin/src/module/planner.cpp b/Marlin/src/module/planner.cpp
index bc84657bf2..7f6ba21272 100644
--- a/Marlin/src/module/planner.cpp
+++ b/Marlin/src/module/planner.cpp
@@ -1092,7 +1092,8 @@ void Planner::_buffer_steps(const int32_t (&target)[XYZE], float fr_mm_s, const
   float max_stepper_speed = 0, min_axis_accel_ratio = 1; // ratio < 1 means acceleration ramp needed
   LOOP_XYZE(i) {
     const float cs = FABS((current_speed[i] = delta_mm[i] * inverse_secs));
-    NOMORE(min_axis_accel_ratio, max_jerk[i] / cs);
+    if (cs >  max_jerk[i]) 
+      NOMORE(min_axis_accel_ratio, max_jerk[i] / cs);
     NOLESS(max_stepper_speed, cs);
     #if ENABLED(DISTINCT_E_FACTORS)
       if (i == E_AXIS) i += extruder;