diff --git a/GcodeFileSplitter.py b/GcodeFileSplitter.py
index b3655be..7620a72 100644
--- a/GcodeFileSplitter.py
+++ b/GcodeFileSplitter.py
@@ -8,7 +8,7 @@ from math import isclose
 logging.basicConfig(level=logging.DEBUG,
                     format='%(asctime)s - %(levelname)s: %(message)s')
 
-FLOAT_OR_INT = r'\d+(\.\d*)?'
+FLOAT_OR_INT = r'-?\d+(\.\d*)?'
 
 RE_LAYER_COUNT = re.compile(r';LAYER_COUNT:(\d+)', re.MULTILINE)
 RE_LAYER = re.compile(r'(;LAYER:\d+)', re.MULTILINE)
@@ -211,5 +211,5 @@ 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\Shuttle.gcode",
-                                        [334])
+    GcodeFileAnalyzer.SplitFileAtLayers(r"Q:\DIY\3Dprint\Models\Thingiverse\Shuttle\Shuttle100.gcode",
+                                        ['87.60mm'])