diff --git a/.gitmodules b/.gitmodules
index ae4fa8a..8a16769 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -10,3 +10,6 @@
 	path = scad/sprocketed_roller
 	url = https://git.sixteenmillimeter.com/modules/sprocketed_roller.git
 	
+[submodule "scad/knobs"]
+	path = scad/knobs
+	url = https://git.sixteenmillimeter.com/modules/knobs.git
diff --git a/scad/knobs b/scad/knobs
new file mode 160000
index 0000000..e0bfb8b
--- /dev/null
+++ b/scad/knobs
@@ -0,0 +1 @@
+Subproject commit e0bfb8b57f7e2fc0c1039c312f77de35410c9b5c