corrected the ultimaker default values, the previous had a calculation error: see: http://groups.google.com/group/ultimaker/browse_thread/thread/91906788639703cf

Marlin/Configuration.h

@@ -204,7 +204,7 @@ const bool ENDSTOPS_INVERTING = true; // set to true to invert the logic of the
 
 // default settings 
 
-#define DEFAULT_AXIS_STEPS_PER_UNIT   {79.87220447,79.87220447,200*8/3,760*1.1}                    // default steps per unit for ultimaker 
+#define DEFAULT_AXIS_STEPS_PER_UNIT   {78.7402,78.7402,200*8/3,760*1.1}                    // default steps per unit for ultimaker 
 //#define DEFAULT_AXIS_STEPS_PER_UNIT   {40, 40, 3333.92, 67} 
 #define DEFAULT_MAX_FEEDRATE          {500, 500, 5, 200000}    // (mm/sec)    
 #define DEFAULT_MAX_ACCELERATION      {9000,9000,100,10000}    // X, Y, Z, E maximum start speed for accelerated moves. E default values are good for skeinforge 40+, for older versions raise them a lot.