config: Add multi extruder sample files

Add sample-multi-extruder.cfg and sample-idex.cfg files.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

config/sample-idex.cfg

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+# This file contains a configuration snippet for a dual extruder
+# printer using dual carriages (an "IDEX" printer).
+
+# See example.cfg and example-extras.cfg for a description of
+# available parameters.
+
+# Definition for the primary carriage (holding the primary extruder)
+[stepper_x]
+step_pin: ar54
+dir_pin: ar55
+enable_pin: !ar38
+step_distance: .0125
+endstop_pin: ^ar3
+position_endstop: 0
+position_max: 200
+homing_speed: 50
+
+# The definition for the primary extruder
+[extruder]
+step_pin: ar26
+dir_pin: ar28
+enable_pin: !ar24
+step_distance: .002
+nozzle_diameter: 0.400
+filament_diameter: 1.750
+heater_pin: ar10
+sensor_type: EPCOS 100K B57560G104F
+sensor_pin: analog13
+control: pid
+pid_Kp: 22.2
+pid_Ki: 1.08
+pid_Kd: 114
+min_temp: 0
+max_temp: 250
+
+# Helper script to park the carriage (called from T0 and T1 macros)
+[gcode_macro PARK_extruder]
+gcode:
+    SAVE_GCODE_STATE NAME=park0
+    G90
+    G1 X0
+    RESTORE_GCODE_STATE NAME=park0
+
+# Activate the primary extruder
+[gcode_macro T0]
+gcode:
+    PARK_{printer.toolhead.extruder}
+    ACTIVATE_EXTRUDER EXTRUDER=extruder
+    SET_DUAL_CARRIAGE CARRIAGE=0
+    SET_GCODE_OFFSET Y=0
+
+# Definition for the secondary carriage and extruder1
+[dual_carriage]
+axis: x
+step_pin: ar16
+dir_pin: ar17
+enable_pin: !ar23
+step_distance: .0125
+endstop_pin: ^ar2
+position_endstop: 200
+position_max: 200
+homing_speed: 50
+
+[extruder1]
+step_pin: ar36
+dir_pin: ar34
+enable_pin: !ar30
+step_distance: .002
+nozzle_diameter: 0.400
+filament_diameter: 1.750
+heater_pin: ar11
+sensor_type: EPCOS 100K B57560G104F
+sensor_pin: analog15
+control: pid
+pid_Kp: 22.2
+pid_Ki: 1.08
+pid_Kd: 114
+min_temp: 0
+max_temp: 250
+
+[gcode_macro PARK_extruder1]
+gcode:
+    SAVE_GCODE_STATE NAME=park1
+    G90
+    G1 X200
+    RESTORE_GCODE_STATE NAME=park1
+
+[gcode_macro T1]
+gcode:
+    PARK_{printer.toolhead.extruder}
+    ACTIVATE_EXTRUDER EXTRUDER=extruder1
+    SET_DUAL_CARRIAGE CARRIAGE=1
+    SET_GCODE_OFFSET Y=15

config/sample-multi-extruder.cfg

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+# This file contains a configuration snippet for a printer using two
+# extruders that are selected by a servo.
+
+# See example.cfg and example-extras.cfg for a description of
+# available parameters.
+
+# The primary extruder
+[extruder]
+step_pin: ar26
+dir_pin: ar28
+enable_pin: !ar24
+step_distance: .004242
+nozzle_diameter: 0.500
+filament_diameter: 3.500
+heater_pin: ar10
+sensor_type: EPCOS 100K B57560G104F
+sensor_pin: analog13
+control: pid
+pid_Kp: 22.2
+pid_Ki: 1.08
+pid_Kd: 114
+min_temp: 0
+max_temp: 210
+
+# Script to change back to the main extruder
+[gcode_macro T0]
+gcode:
+    SET_SERVO SERVO=extruder_servo angle=100    # Lift secondary extruder
+    SET_GCODE_OFFSET Z=0 MOVE=1                 # Adjust z-height
+    SET_GCODE_OFFSET X=0                        # Clear X offset
+    ACTIVATE_EXTRUDER EXTRUDER=extruder
+
+# Secondary extruder
+[extruder1]
+step_pin: ar36
+dir_pin: ar34
+enable_pin: !ar30
+step_distance: .004242
+nozzle_diameter: 0.500
+filament_diameter: 3.500
+heater_pin: ar9
+sensor_pin: analog15
+sensor_type: EPCOS 100K B57560G104F
+control: pid
+pid_Kp: 22.2
+pid_Ki: 1.08
+pid_Kd: 114
+min_temp: 0
+max_temp: 210
+
+# Script to activate second extruder
+[gcode_macro T1]
+gcode:
+    SET_GCODE_OFFSET Z=0.100 MOVE=1             # Adjust z-height
+    SET_SERVO SERVO=extruder_servo angle=100    # Position second extruder
+    SET_GCODE_OFFSET X=5                        # Account for different X offset
+    ACTIVATE_EXTRUDER EXTRUDER=extruder1
+
+# Servo definition
+[servo extruder_servo]
+pin: ar7