diff --git a/doc/threedvis/project.clj b/doc/threedvis/project.clj
new file mode 100644
index 0000000..8d0ac6e
--- /dev/null
+++ b/doc/threedvis/project.clj
@@ -0,0 +1,7 @@
+(defproject threedvis "0.1.0-SNAPSHOT"
+  :description "FIXME: write description"
+  :url "http://example.com/FIXME"
+  :license {:name "Eclipse Public License"
+            :url "http://www.eclipse.org/legal/epl-v10.html"}
+  :dependencies [[org.clojure/clojure "1.6.0"]
+                 [scad-clj "0.2.1"]])
diff --git a/doc/threedvis/src/threedvis/core.clj b/doc/threedvis/src/threedvis/core.clj
new file mode 100644
index 0000000..7d9085d
--- /dev/null
+++ b/doc/threedvis/src/threedvis/core.clj
@@ -0,0 +1,36 @@
+(ns threedvis.core
+  (:require [scad-clj.model :refer :all]
+            [scad-clj.scad :refer :all]))
+
+(defn print-scad [shape]
+  (spit "threedvis.scad" (write-scad shape)))
+
+(defn led []
+ (union
+  (color [0.5 0.5 2]
+         (difference
+          (union
+           (cylinder 10 20)
+           (translate [0 0 10] (sphere 10))
+           (translate [0 0 -8] (cylinder 13 4)))
+          (translate [0 13 -7] (cube 30 5 10))))
+  (color [0.3 0.3 0.3]
+         (union
+          (translate [0 5 -30] (cylinder 1.5 50))
+          (translate [7 5 -60] (rotate (/ pi 4) [0 -1 0] (cylinder 1.5 20))))
+          (translate [14 5 -122] (cylinder 1.5 110))
+         (union
+          (translate [0 -5 -10] (cylinder 1.5 15))
+          (translate [0 -44 -17] (rotate (/ pi 2) [1 0 0] (cylinder 1.5 80)))))))
+
+(defn one-pos []
+ (union
+  (translate [0 0 0] (led))
+  (translate [0 0 100] (led))
+  (translate [0 0 200] (led))))
+
+(print-scad
+ (union
+  (translate [0 0 0] (one-pos))
+  (translate [0 100 0] (one-pos))
+  (translate [0 200 0] (one-pos))))