diff --git a/tools/grid.py b/tools/grid.py
index 22f2210..21b28a7 100644
--- a/tools/grid.py
+++ b/tools/grid.py
@@ -51,14 +51,16 @@ class Grid:
             self.minZ = min(pos.z, self.minZ)
             self.maxZ = max(pos.z, self.maxZ)
 
-    def rangeX(self):
-        return range(self.minX, self.maxX + 1)
+    def rangeX(self, pad: int = 0):
+        return range(self.minX - pad, self.maxX + pad + 1)
 
-    def rangeY(self):
-        return range(self.minY, self.maxY + 1)
+    def rangeY(self, pad: int = 0):
+        return range(self.minY - pad, self.maxY + pad + 1)
 
-    def rangeZ(self):
-        return range(self.minZ, self.maxZ + 1)
+    def rangeZ(self, pad: int = 0):
+        if not self.mode3D:
+            raise ValueError("rangeZ not available in 2D space")
+        return range(self.minZ - pad, self.maxZ + pad + 1)
 
     def toggle(self, pos: Coordinate):
         if pos in self.__grid:
@@ -67,6 +69,15 @@ class Grid:
             self.__trackBoundaries(pos)
             self.__grid[pos] = not self.__default
 
+    def toggleGrid(self):
+        for x in self.rangeX():
+            for y in self.rangeY():
+                if not self.mode3D:
+                    self.toggle(Coordinate(x, y))
+                else:
+                    for z in self.rangeZ():
+                        self.toggle(Coordinate(x, y, z))
+
     def set(self, pos: Coordinate, value: Any = True) -> Any:
         if pos.z is not None:
             self.mode3D = True
@@ -139,12 +150,21 @@ class Grid:
             return list(self.__grid.keys())
 
     def getSum(self, includeNegative: bool = True) -> Numeric:
-        grid_sum = 0
-        for value in self.__grid.values():
-            if includeNegative or value > 0:
-                grid_sum += value
-
-        return grid_sum
+        if not self.mode3D:
+            return sum(
+                self.get(Coordinate(x, y))
+                for x in self.rangeX()
+                for y in self.rangeY()
+                if includeNegative or self.get(Coordinate(x, y)) >= 0
+            )
+        else:
+            return sum(
+                self.get(Coordinate(x, y, z))
+                for x in self.rangeX()
+                for y in self.rangeY()
+                for z in self.rangeZ()
+                if includeNegative or self.get(Coordinate(x, y)) >= 0
+            )
 
     def getNeighboursOf(self, pos: Coordinate, includeDefault: bool = False, includeDiagonal: bool = True) \
             -> List[Coordinate]:
@@ -259,11 +279,11 @@ class Grid:
 
             return pathCoords
 
-    def print(self, spacer: str = "", true_char: str = None):
+    def print(self, spacer: str = "", true_char: str = None, false_char: str = " "):
         for y in range(self.minY, self.maxY + 1):
             for x in range(self.minX, self.maxX + 1):
                 if true_char:
-                    print(true_char if self.get(Coordinate(x, y)) else " ", end="")
+                    print(true_char if self.get(Coordinate(x, y)) else false_char, end="")
                 else:
                     print(self.get(Coordinate(x, y)), end="")
                 print(spacer, end="")