diff --git a/accessories.py b/accessories.py
index fce0cff..59aa715 100644
--- a/accessories.py
+++ b/accessories.py
@@ -47,11 +47,11 @@ def accessories(machine, assembly = None):
 
 if __name__ == '__main__':
     args = len(sys.argv)
-    if args > 1:
-        if args > 2:
+    if args in [2,3]:
+        if args == 3:
             accessories(sys.argv[1], sys.argv[2])
         else:
             accessories(sys.argv[1])
     else:
-        print("usage: accessories mendel|sturdy|your_machine [assembly_name]")
+        print("usage: accessories dibond|mendel|sturdy|your_machine [assembly_name]")
         sys.exit(1)
diff --git a/set_machine.py b/set_machine.py
new file mode 100644
index 0000000..d4c2bc4
--- /dev/null
+++ b/set_machine.py
@@ -0,0 +1,23 @@
+#!/usr/bin/env python
+
+from __future__ import print_function
+
+import sys
+
+def set_machine(machine):
+    text = "include <%s_config.scad>\n" % machine;
+    f = open("scad/conf/machine.scad","rt")
+    line = f.read()
+    f.close()
+    if line != text:
+        f = open("scad/conf/machine.scad","wt")
+        f. write(text);
+        f.close()
+
+if __name__ == '__main__':
+    args = len(sys.argv)
+    if args == 2:
+       set_machine(sys.argv[1])
+    else:
+        print("usage: set_machine dibond|mendel|sturdy|huxley|your_machine")
+        sys.exit(1)
diff --git a/stls.py b/stls.py
index cd626c3..1cea559 100755
--- a/stls.py
+++ b/stls.py
@@ -5,6 +5,7 @@ import openscad
 import shutil
 import sys
 import c14n_stl
+from set_machine import *
 
 from bom import source_dir
 
@@ -40,9 +41,7 @@ def stls(machine, parts = None):
     #
     # Set the target machine
     #
-    f = open(source_dir + "/conf/machine.scad","wt")
-    f. write("include <%s_config.scad>\n" % machine);
-    f.close()
+    set_machine(machine)
 
     #
     # Decide which files to make
@@ -98,5 +97,5 @@ if __name__ == '__main__':
     if len(sys.argv) > 1:
         stls(sys.argv[1], sys.argv[2:])
     else:
-        print("usage: stls [mendel|sturdy|your_machine] [part.stl ...]")
+        print("usage: stls dibond|mendel|sturdy|your_machine [part.stl ...]")
     sys.exit(1)
diff --git a/views.py b/views.py
index 63a51e4..e9401a0 100644
--- a/views.py
+++ b/views.py
@@ -4,6 +4,7 @@ import os
 import sys
 import shutil
 import openscad
+from set_machine import *
 
 
 
@@ -16,9 +17,8 @@ def views(machine):
     #
     # Set the target machine
     #
-    f = open("scad/conf/machine.scad","wt")
-    f.write("include <%s_config.scad>\n" % machine);
-    f.close()
+    set_machine(machine)
+
     #
     # List of individual part files
     #
@@ -66,5 +66,5 @@ if __name__ == '__main__':
     if len(sys.argv) > 1:
         views(sys.argv[1])
     else:
-        print "usage: views [mendel|sturdy|your_machine]"
+        print "usage: views dibond|mendel|sturdy|your_machine"
         sys.exit(1)