fix: config is not required (#6)

README.md

@@ -106,11 +106,8 @@ EOF
 
 ## How to configure it?
 
-Open `z_tramming_settings.cfg` and uncomment the line with `variable_screw_lead`,
-set the number to your lead. The lead is the distance the screw moves in one rotation.
-It is calculated by multiplying the pitch with the number of starts of the screw.
-So a 2mm pitch, 4 start screw has a lead of 8mm.
-You can look at the examples in the file for some known values.
+Open `z_tramming_settings.cfg`.
+There is an example of what values can be configured together with their defaults.
 
 ## Alternatives
 

macros/z_tramming.cfg

@@ -8,11 +8,7 @@ gcode:
     {action_raise_error("Missing probe settings")}
   {% endif %}
 
-  # Verify that required configurations are present
-  {% set config = printer["gcode_macro _Z_TRAMMING_SETTINGS"] %}
-  {% if config is undefined %}
-    {action_raise_error("Missing _Z_TRAMMING_SETTINGS macro")}
-  {% endif %}
+  {% set config = printer["gcode_macro _Z_TRAMMING_SETTINGS"] | default({}) %}
 
   {% set speed = config.speed | default(printer.configfile.settings.bed_mesh.speed) * 60 %}
 
@@ -55,7 +51,7 @@ gcode:
 variable_left: 0
 variable_right: 0
 gcode:
-  {% set config = printer["gcode_macro _Z_TRAMMING_SETTINGS"] %}
+  {% set config = printer["gcode_macro _Z_TRAMMING_SETTINGS"] | default({}) %}
   {% set probe = printer.configfile.settings.probe %}
   {% set tolerance = config.tolerance | default(probe.samples_tolerance * 2)%}
   {% set screw_lead = printer.configfile.settings.stepper_z.rotation_distance | float %}