diff --git a/klippy/klippy.py b/klippy/klippy.py
index 849c5b8b..bf63d01d 100644
--- a/klippy/klippy.py
+++ b/klippy/klippy.py
@@ -35,25 +35,32 @@ Printer is shutdown
 
 class ConfigWrapper:
     error = ConfigParser.Error
+    class sentinel:
+        pass
     def __init__(self, printer, section):
         self.printer = printer
         self.section = section
-    def get(self, option, default=None):
-        if not self.printer.fileconfig.has_option(self.section, option):
+    def get_wrapper(self, parser, option, default):
+        if (default is not self.sentinel
+            and not self.printer.fileconfig.has_option(self.section, option)):
             return default
-        return self.printer.fileconfig.get(self.section, option)
-    def getint(self, option, default=None):
-        if not self.printer.fileconfig.has_option(self.section, option):
-            return default
-        return self.printer.fileconfig.getint(self.section, option)
-    def getfloat(self, option, default=None):
-        if not self.printer.fileconfig.has_option(self.section, option):
-            return default
-        return self.printer.fileconfig.getfloat(self.section, option)
-    def getboolean(self, option, default=None):
-        if not self.printer.fileconfig.has_option(self.section, option):
-            return default
-        return self.printer.fileconfig.getboolean(self.section, option)
+        try:
+            return parser(self.section, option)
+        except self.error, e:
+            raise
+        except:
+            raise self.error("Unable to parse option '%s' in section '%s'" % (
+                option, self.section))
+    def get(self, option, default=sentinel):
+        return self.get_wrapper(self.printer.fileconfig.get, option, default)
+    def getint(self, option, default=sentinel):
+        return self.get_wrapper(self.printer.fileconfig.getint, option, default)
+    def getfloat(self, option, default=sentinel):
+        return self.get_wrapper(
+            self.printer.fileconfig.getfloat, option, default)
+    def getboolean(self, option, default=sentinel):
+        return self.get_wrapper(
+            self.printer.fileconfig.getboolean, option, default)
     def getsection(self, section):
         return ConfigWrapper(self.printer, section)
 
diff --git a/klippy/mcu.py b/klippy/mcu.py
index 09942df8..5d61d5b1 100644
--- a/klippy/mcu.py
+++ b/klippy/mcu.py
@@ -394,7 +394,7 @@ class MCU:
 
         # Resolve pin names
         mcu = self.serial.msgparser.config['MCU']
-        pin_map = self._config.get('pin_map')
+        pin_map = self._config.get('pin_map', None)
         if pin_map is None:
             pnames = pins.mcu_to_pins(mcu)
         else:
diff --git a/klippy/stepper.py b/klippy/stepper.py
index 2def4368..f770afdb 100644
--- a/klippy/stepper.py
+++ b/klippy/stepper.py
@@ -23,9 +23,9 @@ class PrinterStepper:
         self.homing_positive_dir = config.getboolean(
             'homing_positive_dir', False)
         self.homing_retract_dist = config.getfloat('homing_retract_dist', 5.)
-        self.homing_stepper_phases = config.getint('homing_stepper_phases')
-        self.homing_endstop_phase = config.getint('homing_endstop_phase')
-        endstop_accuracy = config.getfloat('homing_endstop_accuracy')
+        self.homing_stepper_phases = config.getint('homing_stepper_phases', None)
+        self.homing_endstop_phase = config.getint('homing_endstop_phase', None)
+        endstop_accuracy = config.getfloat('homing_endstop_accuracy', None)
         self.homing_endstop_accuracy = None
         if self.homing_stepper_phases:
             if endstop_accuracy is None:
@@ -40,9 +40,11 @@ class PrinterStepper:
                 logging.info("Endstop for %s is not accurate enough for stepper"
                              " phase adjustment" % (self.config.section,))
                 self.homing_stepper_phases = None
-        self.position_min = config.getfloat('position_min', 0.)
-        self.position_endstop = config.getfloat('position_endstop')
-        self.position_max = config.getfloat('position_max')
+        self.position_min = self.position_endstop = self.position_max = None
+        if config.get('endstop_pin', None) is not None:
+            self.position_min = config.getfloat('position_min', 0.)
+            self.position_endstop = config.getfloat('position_endstop')
+            self.position_max = config.getfloat('position_max', 0.)
 
         self.need_motor_enable = True
     def set_max_jerk(self, max_jerk):
@@ -59,10 +61,10 @@ class PrinterStepper:
         mcu = self.printer.mcu
         self.mcu_stepper = mcu.create_stepper(
             step_pin, dir_pin, min_stop_interval, max_error)
-        enable_pin = self.config.get('enable_pin')
+        enable_pin = self.config.get('enable_pin', None)
         if enable_pin is not None:
             self.mcu_enable = mcu.create_digital_out(enable_pin, 0)
-        endstop_pin = self.config.get('endstop_pin')
+        endstop_pin = self.config.get('endstop_pin', None)
         if endstop_pin is not None:
             self.mcu_endstop = mcu.create_endstop(endstop_pin, self.mcu_stepper)
     def motor_enable(self, move_time, enable=0):