diff --git a/raspberryjammod/mcpipy/ltree.py b/raspberryjammod/mcpipy/ltree.py
index a6f6461..81e215a 100644
--- a/raspberryjammod/mcpipy/ltree.py
+++ b/raspberryjammod/mcpipy/ltree.py
@@ -1,4 +1,4 @@
-#
+#
 # Code under the MIT license by Alexander Pruss
 #
 
diff --git a/raspberryjammod/mcpipy/polyhedron.py b/raspberryjammod/mcpipy/polyhedron.py
index ad960f9..545d957 100644
--- a/raspberryjammod/mcpipy/polyhedron.py
+++ b/raspberryjammod/mcpipy/polyhedron.py
@@ -1,5 +1,5 @@
 #The software in this file is copyright 2003,2004 Simon Tatham and copyright 2015 Alexander Pruss
-#Based on code from # http://www.chiark.greenend.org.uk/~sgtatham/polyhedra/
+#Based on code from http://www.chiark.greenend.org.uk/~sgtatham/polyhedra/
 #
 #Permission is hereby granted, free of charge, to any person
 #obtaining a copy of this software and associated documentation files
@@ -755,4 +755,3 @@ if __name__ == "__main__":
 
     pos = d.mc.player.getPos()
     polyhedron(d,n,faceMode,pos.x, pos.y, pos.z, size,drawing.GLASS,drawing.STONE)
-
diff --git a/raspberryjammod/mcpipy/render.py b/raspberryjammod/mcpipy/render.py
index a734e70..96b29ac 100644
--- a/raspberryjammod/mcpipy/render.py
+++ b/raspberryjammod/mcpipy/render.py
@@ -851,4 +851,4 @@ if __name__ == "__main__":
 
             mainloop()
     else:
-        go("models/" + sys.argv[1] + ".txt", sys.argv[2:])
+        go(os.path.dirname(os.path.realpath(sys.argv[0])) + "/" + "models/" + sys.argv[1] + ".txt", sys.argv[2:])
diff --git a/raspberryjammod/mcpipy/sierpinski3d.py b/raspberryjammod/mcpipy/sierpinski3d.py
index 482425d..f126aa7 100644
--- a/raspberryjammod/mcpipy/sierpinski3d.py
+++ b/raspberryjammod/mcpipy/sierpinski3d.py
@@ -6,12 +6,19 @@ from mc import *
 import drawing
 from sys import argv
 import mcpi.settings as settings
+import ast
 
 RAINBOW = (WOOL_RED,WOOL_PINK,WOOL_ORANGE,WOOL_YELLOW,WOOL_GREEN,WOOL_BLUE,WOOL_LIGHT_BLUE,WOOL_PURPLE)
 
 TAN30 = sqrt(3.)/3
 SQRT32 = sqrt(3./2)
 
+def parseBlock(s):
+    try:
+        return ast.literal_eval(s)
+    except:
+        return globals()[s.upper()]
+
 def distance(a,b):
     return sqrt((a[0]-b[0])**2+(a[1]-b[1])**2+(a[2]-b[2])**2)
 
@@ -59,7 +66,8 @@ mc.player.setPos(tetrahedronBottom(height,(pos.x,pos.y+height,pos.z))[0])
 tetrahedra = sierpinski(height,pos.x,pos.y+height,pos.z,levels)
 mc.postToChat("Drawing")
 if len(argv) >= 2 and '__' not in argv[1]:
-    block = lambda level : eval(argv[1])
+    specifiedBlock = parseBlock(argv[1])
+    block = lambda level : specifiedBlock
 else:
     block = lambda level : RAINBOW[level % len(RAINBOW)]
 for tet in tetrahedra: