From e358a2d7afae323abc7205cef31615a4d6b0258c Mon Sep 17 00:00:00 2001
From: Erik vd Zalm <erik@vdzalm.eu>
Date: Sun, 2 Sep 2012 01:12:49 +0200
Subject: [PATCH] Added fix for SF Arc Point fillet procedure

---
 Marlin/Configuration.h | 3 +++
 Marlin/Marlin.pde      | 8 ++++++++
 2 files changed, 11 insertions(+)

diff --git a/Marlin/Configuration.h b/Marlin/Configuration.h
index f01af4144..0ec06316f 100644
--- a/Marlin/Configuration.h
+++ b/Marlin/Configuration.h
@@ -285,6 +285,9 @@ const bool Z_ENDSTOPS_INVERTING = true; // set to true to invert the logic of th
 // Data from: http://www.doc-diy.net/photo/rc-1_hacked/
 // #define PHOTOGRAPH_PIN     23
 
+// SF send wrong arc g-codes when using Arc Point as fillet procedure
+//#define SF_ARC_FIX
+
 #include "Configuration_adv.h"
 #include "thermistortables.h"
 
diff --git a/Marlin/Marlin.pde b/Marlin/Marlin.pde
index f8ae5b874..89104333b 100644
--- a/Marlin/Marlin.pde
+++ b/Marlin/Marlin.pde
@@ -1576,7 +1576,15 @@ void get_coordinates()
 
 void get_arc_coordinates()
 {
+#ifdef SF_ARC_FIX
+   bool relative_mode_backup = relative_mode;
+   bool relative_mode = true;
+#endif
    get_coordinates();
+#ifdef SF_ARC_FIX
+   relative_mode=relative_mode_backup;
+#endif
+
    if(code_seen('I')) {
      offset[0] = code_value();
    }