2 files changed, 3 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index b6ac877..998b0ac 100644
--- a/Makefile
+++ b/Makefile
@@ -1,12 +1,12 @@
 -include Makefile.local
 
 OPENSCAD_APP?=/Applications/OpenSCAD.app
 OPENSCAD_BIN?=${OPENSCAD_APP}/Contents/MacOS/OpenSCAD
 
-default: fanduct-circular.stl fanduct-3jets.stl
+default: fanduct-circular.stl fanduct-3jets.stl fanduct-dual.stl
 
 clean:
         rm -f *.stl
 
 fanduct-%.stl: fanduct-%.scad fanduct.scad
 
diff --git a/fanduct-dual.scad b/fanduct-dual.scad
new file mode 100644
index 0000000..a6995ff
--- a/dev/null
+++ b/fanduct-dual.scad
@@ -0,0 +1,2 @@
+use <fanduct.scad>;
+fanduct(dual=true);