diff --git a/defaults.h b/defaults.h
index 30e575dd8..c17e95a65 100644
--- a/defaults.h
+++ b/defaults.h
@@ -119,6 +119,41 @@
   #define DEFAULT_N_ARC_CORRECTION 25
 #endif
 
+#ifdef DEFAULTS_SHAPEOKO_2
+  // Description: Shapeoko CNC mill with three NEMA 17 stepper motors, driven by Synthetos
+  // grblShield with a 24V, 4.2A power supply.
+  #define MICROSTEPS_XY 8
+  #define STEP_REVS_XY 200
+  #define MM_PER_REV_XY (2*20) // 2mm belt pitch, 20 pulley teeth
+  #define MICROSTEPS_Z 2
+  #define STEP_REVS_Z 200
+  #define MM_PER_REV_Z 1.250 // 1.25 mm/rev leadscrew
+  #define DEFAULT_X_STEPS_PER_MM (MICROSTEPS_XY*STEP_REVS_XY/MM_PER_REV_XY)
+  #define DEFAULT_Y_STEPS_PER_MM (MICROSTEPS_XY*STEP_REVS_XY/MM_PER_REV_XY)
+  #define DEFAULT_Z_STEPS_PER_MM (MICROSTEPS_Z*STEP_REVS_Z/MM_PER_REV_Z)
+  #define DEFAULT_STEP_PULSE_MICROSECONDS 10
+  #define DEFAULT_MM_PER_ARC_SEGMENT 0.1
+  #define DEFAULT_RAPID_FEEDRATE 800.0 // mm/min
+  #define DEFAULT_FEEDRATE 250.0
+  #define DEFAULT_ACCELERATION (15.0*60*60) // 15 mm/min^2
+  #define DEFAULT_JUNCTION_DEVIATION 0.05 // mm
+  #define DEFAULT_STEPPING_INVERT_MASK ((1<<Y_DIRECTION_BIT)|(1<<Z_DIRECTION_BIT))
+  #define DEFAULT_REPORT_INCHES 0 // false
+  #define DEFAULT_AUTO_START 1 // true
+  #define DEFAULT_INVERT_ST_ENABLE 0 // false
+  #define DEFAULT_HARD_LIMIT_ENABLE 0  // false
+  #define DEFAULT_HOMING_ENABLE 0  // false
+  #define DEFAULT_HOMING_DIR_MASK 0 // move positive dir
+  #define DEFAULT_HOMING_RAPID_FEEDRATE 250.0 // mm/min
+  #define DEFAULT_HOMING_FEEDRATE 25.0 // mm/min
+  #define DEFAULT_HOMING_DEBOUNCE_DELAY 100 // msec (0-65k)
+  #define DEFAULT_HOMING_PULLOFF 1.0 // mm
+  #define DEFAULT_STEPPER_IDLE_LOCK_TIME 255 // msec (0-255)
+  #define DEFAULT_DECIMAL_PLACES 3
+  #define DEFAULT_N_ARC_CORRECTION 25
+#endif
+
+
 #ifdef DEFAULTS_ZEN_TOOLWORKS_7x7
   // Description: Zen Toolworks 7x7 mill with three Shinano SST43D2121 65oz-in NEMA 17 stepper motors.
   // Leadscrew is different from some ZTW kits, where most are 1.25mm/rev rather than 8.0mm/rev here.