diff --git a/GCodeAnalyzer.py b/GCodeAnalyzer.py
index f0f8c12..0332701 100644
--- a/GCodeAnalyzer.py
+++ b/GCodeAnalyzer.py
@@ -68,7 +68,7 @@ class GCodeAnalyzer():
       
   # find a code in a gstring line   
   def findCode(self, gcode, codeStr):
-      pattern = re.compile(codeStr + "\\s*([\d.-]*)",re.I)
+      pattern = re.compile(codeStr + "\\s*(-?[\d.]*)",re.I)
       m=re.search(pattern, gcode)
       if m == None:
         return None
@@ -76,7 +76,8 @@ class GCodeAnalyzer():
         return m.group(1)
     
   def Analyze(self, gcode):
-    gcode = gcode[:gcode.find(";")] # remove comments
+    gcode = gcode[:gcode.find(";")].lstrip() # remove comments
+    if gcode.startswith("@"): return # code is a host command
     code_g = self.findCode(gcode, "G")
     code_m = self.findCode(gcode, "M")
     # we have a g_code
diff --git a/gcoder.py b/gcoder.py
index a62efb8..e2182e8 100755
--- a/gcoder.py
+++ b/gcoder.py
@@ -31,7 +31,7 @@ class Line(object):
 		self.relative = False
 		
 		#ignore host commands
-		if "@" in self.raw:
+		if self.raw.startswith("@"):
 		  self.raw = ""
 		
 		if ";" in self.raw:
diff --git a/printcore.py b/printcore.py
index 02c5361..fa01258 100755
--- a/printcore.py
+++ b/printcore.py
@@ -229,16 +229,16 @@ class printcore():
         if filename == None: return
         f = None
         try:
-	  f = open(filename)
+          f = open(filename)
         except:
-	  pass
-	
-	if f != None:
-	  for i in f:
-	    l = i.replace("\n", "")
-	    l = l[:l.find(";")] #remove comment
-	    self.send_now(l)
-	  f.close()
+          pass
+
+        if f != None:
+          for i in f:
+            l = i.replace("\n", "")
+            l = l[:l.find(";")] #remove comment
+            self.send_now(l)
+          f.close()
         
     def pause(self):
         """Pauses the print, saving the current position.
@@ -249,9 +249,10 @@ class printcore():
         # try joining the print thread: enclose it in try/except because we might be calling it from the thread itself
         
         try:
-	  self.print_thread.join()
-	except: pass
-	
+          self.print_thread.join()
+        except:
+          pass
+        
         self.print_thread = None
         
         # saves the status
@@ -349,11 +350,12 @@ class printcore():
 
     #now only "pause" is implemented as host command
     def processHostCommand(self, command):
+        command = command.lstrip()
         if command == "@pause":
-	  if self.pronterface != None:
-	    self.pronterface.pause(None)
-	  else:
-	    self.pause()
+          if self.pronterface != None:
+            self.pronterface.pause(None)
+          else:
+            self.pause()
             
     def _sendnext(self):
         if not self.printer:
@@ -376,12 +378,12 @@ class printcore():
         if self.printing and self.queueindex < len(self.mainqueue):
             tline = self.mainqueue[self.queueindex]
             #check for host command
-            if tline.startswith("@"):
-	      #it is a host command: pop it from the list
-	      self.mainqueue.pop(self.queueindex)
-	      self.processHostCommand(tline)
-	      return
-	      
+            if tline.lstrip().startswith("@"):
+              #it is a host command: pop it from the list
+              self.mainqueue.pop(self.queueindex)
+              self.processHostCommand(tline)
+             return
+      
             tline = tline.split(";")[0]
             if len(tline) > 0:
                 self._send(tline, self.lineno, True)
diff --git a/pronterface.py b/pronterface.py
index 82c84a6..4a84772 100755
--- a/pronterface.py
+++ b/pronterface.py
@@ -134,14 +134,17 @@ class PronterWindow(MainWindow, pronsole.pronsole):
         self.build_dimensions_list = self.get_build_dimensions(self.settings.build_dimensions)
         
         #initialize the code analyzer with the correct sizes. There must be a more general way to do so
-        self.p.analyzer.maxX = self.build_dimensions_list[0] if self.build_dimensions_list[0] >= self.build_dimensions_list[6] else self.build_dimensions_list[6] # maximum x is maximum x if maximum X > home X, else it is home X
-        self.p.analyzer.maxY = self.build_dimensions_list[1] if self.build_dimensions_list[1] >= self.build_dimensions_list[7] else self.build_dimensions_list[7]
-        self.p.analyzer.maxZ = self.build_dimensions_list[2] if self.build_dimensions_list[2] >= self.build_dimensions_list[8] else self.build_dimensions_list[8]
-        
+
+        # minimum = offset
         self.p.analyzer.minX = self.build_dimensions_list[3]
         self.p.analyzer.minY = self.build_dimensions_list[4]
         self.p.analyzer.minZ = self.build_dimensions_list[5]
         
+        #max = offset + bedsize
+        self.p.analyzer.maxX = self.build_dimensions_list[3] + self.build_dimensions_list[0]
+        self.p.analyzer.maxY = self.build_dimensions_list[4] + self.build_dimensions_list[1]
+        self.p.analyzer.maxZ = self.build_dimensions_list[5] + self.build_dimensions_list[2]
+        
         self.p.analyzer.homeX = self.build_dimensions_list[6]
         self.p.analyzer.homeY = self.build_dimensions_list[7]
         self.p.analyzer.homeZ = self.build_dimensions_list[8]