config: Update printer-robo3d-r2-2017.cfg

Improvements and fixes based on feedback:
 * Make speeds and limits more conservative
 * Fix Y endstop position
 * Improve IR bed leveling
 * Fix filament runout pin

Signed-off-by: Justin Schuh <code@justinschuh.com>

config/printer-robo3d-r2-2017.cfg

@@ -14,7 +14,7 @@ microsteps: 16
 rotation_distance: 40
 endstop_pin: ^PE5
 position_endstop: 0
-position_max: 200
+position_max: 195
 homing_speed: 120
 
 [stepper_y]
@@ -24,9 +24,9 @@ enable_pin: !PF2
 microsteps: 16
 rotation_distance: 40
 endstop_pin: ^PJ1
-position_endstop: 197
+position_endstop: 195
 position_min: 0
-position_max: 200
+position_max: 195
 homing_speed: 120
 
 [stepper_z]
@@ -74,26 +74,29 @@ pid_kd: 121.707
 pin: ^PD2
 x_offset: 2
 y_offset: 30
-z_offset: 10 # Safe value. Adjust for your nozzle offset.
+z_offset: 1 # Safe value. Adjust for your nozzle offset.
 sample_retract_dist: 1.0
 # Below are very conservative settings, as the IR probe has repeatability
 # issues depending on visual characteristics of the build surface.
+# Polycarbonate build surfaces (e.g. BuildTak) work best with the IR sensor.
+# Persistent repeatablity issues are usually due to excessive ambient light.
+# Try darkening the room or otherwise preventing light from interfering with
+# the IR sensor on the extruder.
 samples: 3
 samples_tolerance: 0.2
 samples_tolerance_retries: 5
-samples_result: median
 
 [safe_z_home]
 home_xy_position: 100, 70
 speed: 150
 z_hop: 10
-z_hop_speed: 10
+z_hop_speed: 5
 
 [bed_mesh]
 speed: 200
-horizontal_move_z: 8
-mesh_min: 30, 30
-mesh_max: 170, 170
+horizontal_move_z: 5
+mesh_min: 5, 30
+mesh_max: 190, 195
 probe_count: 4, 4
 fade_start: 1
 fade_end: 5
@@ -139,11 +142,11 @@ serial: /dev/ttyACM0
 #serial: /tmp/klipper_host_mcu
 #
 # [filament_switch_sensor sensor0]
-# switch_pin: host:gpio21
+# switch_pin: ^!host:gpio21
 
 [printer]
 kinematics: cartesian
 max_velocity: 300
 max_accel: 3000
 max_z_velocity: 20
-max_z_accel: 1000
+max_z_accel: 100