diff --git a/GcodeFileSplitter.py b/GcodeFileSplitter.py
index fdce507..cb99eed 100644
--- a/GcodeFileSplitter.py
+++ b/GcodeFileSplitter.py
@@ -42,11 +42,11 @@ class GcodeFileAnalyzer:
                 f.write('\n'.join(lines))
 
     def __init__(self, lines):
-        self.curaVersion: tuple(int) = None
-        self.lines: list(str) = lines
-        self.header: list(str) = []
-        self.footer: list(str) = []
-        self.layers: list('Layer') = []
+        self.curaVersion: tuple[int] = None
+        self.lines: list[str] = lines
+        self.header: list[str] = []
+        self.footer: list[str] = []
+        self.layers: list['Layer'] = []
         self.layerCount: int = 0
         self.fanSpeedCode: str = ''
         self.__AnalyzeGcode()
@@ -58,7 +58,7 @@ class GcodeFileAnalyzer:
         versionMatch = RE_ENGINE_VERSION.search(fullCode)
         if versionMatch:
             self.curaVersion = tuple(int(v) for v in versionMatch.group(1).split('.'))
-            logging.info('Cura version {self.curaVersion}')
+            logging.info(f'Cura version {self.curaVersion}')
         else:
             v5engineMatch = RE_ENGINE_V5.search(fullCode)
             if v5engineMatch:
@@ -148,7 +148,7 @@ class GcodeFileAnalyzer:
         # Add default header
         lines = list(self.header)
         logging.info('Exporting Layers {} ({} mm) ... {} ({} mm)'
-                     .format(startLayer.number + 1, startLayer.zHeight, 
+                     .format(startLayer.number + 1, startLayer.zHeight,
                              endLayer.number + 1, endLayer.zHeight))
 
         if startLayer.number != 0:
@@ -242,18 +242,4 @@ class Layer:
 
 
 if __name__ == '__main__':
-    # GcodeFileAnalyzer.SplitFileAtLayers('test/BigL.gcode', ['2.8001mm', 300])
-    # GcodeFileAnalyzer.SplitFileAtLayers(r"Q:\DIY\3Dprint\Models\Thingiverse\Murmelbahnen\The_Cyclone_triple_lift_triple_track_marble_machine\files\gcode\Marble_machine.gcode",
-    #                                     ['97.3mm', 405, 480])
-    # GcodeFileAnalyzer.SplitFileAtLayers(r"Q:\DIY\3Dprint\Models\Thingiverse\Shuttle\Shuttle100.gcode",
-    #                                     ['87.60mm'])
-    # GcodeFileAnalyzer.SplitFileAtLayers(r"Q:\DIY\3Dprint\Models\Geschenke\Nudossi\NudossiDeckel_Yakup.gcode",
-    #                                     [124])
-    # GcodeFileAnalyzer.SplitFileAtLayers(r"Q:\DIY\3Dprint\Models\Geschenke\Nudossi\NudossiDeckel_Harun.gcode",
-    #                                     [124])
-    # GcodeFileAnalyzer.SplitFileAtLayers(r"Q:\DIY\3Dprint\Models\Thingiverse\MoonLamp\gcode\moon5inches.gcode",
-    #                                     [100, 200, 400, 600, 700])
-    # GcodeFileAnalyzer.SplitFileAtLayers(r"Q:\DIY\3Dprint\Models\Benjamin\Vier_Cura5.1.1.gcode",
-    #                                     [42])
-    GcodeFileAnalyzer.SplitFileAtLayers(r"Q:\DIY\3Dprint\Models\Geschenke\Mama\Herz\MarkusTinaHerz.gcode",
-                                        [31])
+    GcodeFileAnalyzer.SplitFileAtLayers('test/BigL.gcode', ['2.8mm', 300])
\ No newline at end of file
diff --git a/README.md b/README.md
index acfd306..4a2d556 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ Tested with GCode files from
 
 ## Requirements
 
-* Python 3.7
+* Python >=3.9
 
 ## Usage
 
@@ -25,6 +25,6 @@ GcodeFileAnalyzer.SplitFileAtLayers(
 )
 ```
 
-* The Z position where to split the file can be given in layer number (starting with 0) or in millimeters (value must match an actual layer z position in the gcode file)
+* The Z position where to split the file can be given in layer number (starting with 1) or in millimeters (value must match an actual layer z position in the gcode file)
 * Execute `GcodeFileSplitter.py`
   * E.g.: `python GcodeFileSplitter.py`