globals: Allow placeholders in start_end_park_y

README.md

@@ -910,9 +910,11 @@ These are the customization options you can add to your
   smaller or thinner beds you may want to reduce this value or disable it
   entirely by setting it to `0.0`.
 
-* `variable_start_end_park_y` *(default: `print_max` Y coordinate)* - The final
-  Y position of the toolhead in the `PRINT_END` macro, to ensure that the
-  toolhead is out of the way when the bed is presented for print removal.
+* `variable_start_end_park_y` *(default: `max`)* - The final Y position of the
+  toolhead in the `PRINT_END` macro, to ensure that the toolhead is out of the
+  way when the bed is presented for print removal. This can be set to a Y
+  coordinate (e.g. `0.0`), `max` to use `stepper_y.position_max`, or `min` to
+  use `stepper_y.position_min`.
 
 * `variable_start_extruder_preheat_scale` *(default: 0.5)* - This value is
   multiplied by the target extruder temperature and the result is used as the

globals.cfg

@@ -61,8 +61,8 @@ variable_start_bed_heat_delay: 2000
 variable_start_bed_heat_overshoot: 2.0
 # Set to clear adjustments (e.g. feedrate, extrusion, heater) at end of print.
 variable_start_clear_adjustments_at_end: True
-# Final Y position of toolhead in PRINT_END. Defaults to print_max Y.
-variable_start_end_park_y: 0.0
+# PRINT_END Y park position (set "max" or "min" to infer from stepper config).
+variable_start_end_park_y: 0.0 # Defaults to print_max Y.
 # Extruder scale factor during pre-warmup in PRINT_START.
 variable_start_extruder_preheat_scale: 0.5
 # If non-zero the extruder will stabilize at this temp before probing the bed.
@@ -184,6 +184,13 @@ gcode:
     {% set dummy = options.__setitem__("park_y",
                       printer.configfile.settings.stepper_y.position_max) %}
   {% endif %}
+  {% if options.start_end_park_y|default("")|string|lower == "min" %}
+    {% set dummy = options.__setitem__("start_end_park_y",
+                      printer.configfile.settings.stepper_y.position_min) %}
+  {% elif options.start_end_park_y|default("")|string|lower == "max" %}
+    {% set dummy = options.__setitem__("start_end_park_y",
+                      printer.configfile.settings.stepper_y.position_max) %}
+  {% endif %}
   {% if options.park_z|default("")|string|lower == "min" %}
     {% set dummy = options.__setitem__("park_z",
                       printer.configfile.settings.stepper_z.position_min) %}
@@ -230,12 +237,6 @@ gcode:
     {% endif %}
   {% endfor %}
 
-  # Defaults that can alias to a user override.
-  {% if "print_max" in options and "start_end_park_y" not in options %}
-    SET_GCODE_VARIABLE MACRO=_km_globals VARIABLE=start_end_park_y VALUE="{
-      options.print_max[1] }"
-  {% endif %}
-
   {% if "homing_override" in printer.configfile.config %}
     {% for l in printer.configfile.config.homing_override.gcode.split("\n") %}
         {% if " g28 " in (" " ~ l.split("\x23")[0].split(";")[0]|lower ~ " ") %}