diff --git a/macros/macros.cfg b/macros/macros.cfg
index 486ea60..3a6f971 100644
--- a/macros/macros.cfg
+++ b/macros/macros.cfg
@@ -1,18 +1,27 @@
 [pause_resume]
 [display_status]
 
+[gcode_macro _globals]
+variable_pre_purge_prime_length: 1.4
+gcode:
+    SET_GCODE_VARIABLE MACRO=_globals VARIABLE=pre_purge_prime_length VALUE={ variable_pre_purge_prime_length }
+
 [gcode_macro PURGE_LINE]
 # https://github.com/JoeCat1207/V0.1-Purge-line-SuperSlicer/blob/main/Purgeline.txt
 gcode:
-    G0 Y0 X40 F4000               ; go to tongue of print bed
-    G1 Z0.2 F500.0                 ; move bed to nozzle
-    G92 E0.0                       ; reset extruder
-    G1 E1.40 F500                  ; pre-purge prime LENGTH SHOULD MATCH YOUR PRINT_END RETRACT
-    G1 X80 E8.0 F500.0             ; intro line 1
-    G1 Y0.3                        ; move in a little
-    G1 X40 E8.0 F500.0             ; second line
-    G92 E0.0                       ; reset extruder
-    G1 Z2.0                        ; move nozzle to prevent scratch
+    {% set PRE_PURGE_PRIME_LENGTH=printer["gcode_macro _globals"].pre_purge_prime_length %}
+    {% if not PRE_PURGE_PRIME_LENGTH %}
+        {action_raise_error('Pre purge prime length not found')}
+    {% endif %}
+    G0 Y0 X40 F4000                         ; go to tongue of print bed
+    G1 Z0.2 F500.0                          ; move bed to nozzle
+    G92 E0.0                                ; reset extruder
+    G1 E{PRE_PURGE_PRIME_LENGTH} F500       ; pre-purge prime LENGTH SHOULD MATCH YOUR PRINT_END RETRACT
+    G1 X80 E8.0 F500.0                      ; intro line 1
+    G1 Y0.3                                 ; move in a little
+    G1 X40 E8.0 F500.0                      ; second line
+    G92 E0.0                                ; reset extruder
+    G1 Z2.0                                 ; move nozzle to prevent scratch
 
 # DELETEME
 # [gcode_macro CANCEL_PRINT]
@@ -58,10 +67,14 @@ gcode:
 [gcode_macro PRINT_END]
 #   Use PRINT_END for the slicer ending script - please customize for your slicer of choice
 gcode:
-    M400                           ; wait for buffer to clear
-    G92 E0                         ; zero the extruder
-    G1 E-1.40 F400                 ; retract filament
-    G91                            ; relative positioning
+    {% set PRE_PURGE_PRIME_LENGTH=printer["gcode_macro _globals"].pre_purge_prime_length %}
+    {% if not PRE_PURGE_PRIME_LENGTH %}
+        {action_raise_error('Pre purge prime length not found')}
+    {% endif %}
+    M400                                    ; wait for buffer to clear
+    G92 E0                                  ; zero the extruder
+    G1 E-{PRE_PURGE_PRIME_LENGTH} F400      ; retract filament
+    G91                                     ; relative positioning
 
     #   Get Boundaries
     {% set max_x = printer.configfile.config["stepper_x"]["position_max"]|float %}