Apply patch for the issue at

https://github.com/TurnkeyTyranny/laser-gcode-exporter-inkscape-plugin/issues/11

turnkeylaser.py

@@ -667,7 +667,7 @@ class Gcode_tools(inkex.Effect):
          
         #Do not remove these two lines, they're important. Will not raster correctly if feedrate is not set prior.
         #Move fast to point, cut at correct speed.
-        if(cutFeed < self.options.Mfeed):
+        if(int("".join([x for x in list(cutFeed) if x.isdigit()])) < int(self.options.Mfeed)):
             gcode += 'G0 X'+str(curve['x'])+' Y'+str(curve['y'])+' F'+str(self.options.Mfeed)+'\n'
         gcode += 'G0 X'+str(curve['x'])+' Y'+str(curve['y'])+' '+cutFeed+'\n'