Merge pull request #4296 from jbrazio/feature/bqh2-update

Update the bq Hephestos 2 configuration

Marlin/example_configurations/Hephestos_2/Configuration.h

 
 // default settings
 
-#define DEFAULT_AXIS_STEPS_PER_UNIT   {160, 160, 8000, 203} // default steps per unit for Ultimaker
-#define DEFAULT_MAX_FEEDRATE          {250, 250, 2, 200}      // (mm/sec)
-#define DEFAULT_MAX_ACCELERATION      {1000, 1000, 20, 1000}   // 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.
+#define DEFAULT_AXIS_STEPS_PER_UNIT   {160, 160, 8000, 210.02}  // Steps per unit
+#define DEFAULT_MAX_FEEDRATE          {250, 250, 2, 200}        // mm/sec
+#define DEFAULT_MAX_ACCELERATION      {1000, 1000, 20, 1000}    // X, Y, Z, E max start speed for accelerated moves
 
 #define DEFAULT_ACCELERATION          1000    // X, Y, Z and E acceleration in mm/s^2 for printing moves
 #define DEFAULT_RETRACT_ACCELERATION  3000    // E acceleration in mm/s^2 for retracts
 #define DEFAULT_TRAVEL_ACCELERATION   1000    // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves
 
 // The speed change that does not require acceleration (i.e. the software might assume it can be done instantaneously)
-#define DEFAULT_XYJERK                10.0    // (mm/sec)
+#define DEFAULT_XYJERK                20.0    // (mm/sec)
 #define DEFAULT_ZJERK                  0.4    // (mm/sec)
 #define DEFAULT_EJERK                  2.0    // (mm/sec)
 

Marlin/example_configurations/Hephestos_2/README.md

  * 2016/06/21 - Disabled hot bed related options
                 Activated software endstops
                 SD printing now disables the heater when finished
+ * 2016/07/13 - Update the `DEFAULT_AXIS_STEPS_PER_UNIT` for the Z axis
+                Increased the `DEFAULT_XYJERK`