diff --git a/justfile b/justfile
index 4418cef..43c3209 100644
--- a/justfile
+++ b/justfile
@@ -1,16 +1,6 @@
-parts := "cartridge receptacle"
+mod models
 
 default: build
 
 build:
-	#!/bin/sh
-	for part in {{parts}}; do
-		echo "Rendering $part..."
-		just render-part $part
-	done
-
-render-part part:
-	#!/bin/sh
-	echo 'use <{{part}}.scad>; $fn = 128; {{part}}();' > part.scad
-	openscad --backend Manifold -o {{part}}.stl part.scad
-	rm part.scad
+	@just models/build
diff --git a/cartridge.scad b/models/cartridge.scad
similarity index 100%
rename from cartridge.scad
rename to models/cartridge.scad
diff --git a/cartridge.stl b/models/cartridge.stl
similarity index 100%
rename from cartridge.stl
rename to models/cartridge.stl
diff --git a/models/justfile b/models/justfile
new file mode 100644
index 0000000..4418cef
--- /dev/null
+++ b/models/justfile
@@ -0,0 +1,16 @@
+parts := "cartridge receptacle"
+
+default: build
+
+build:
+	#!/bin/sh
+	for part in {{parts}}; do
+		echo "Rendering $part..."
+		just render-part $part
+	done
+
+render-part part:
+	#!/bin/sh
+	echo 'use <{{part}}.scad>; $fn = 128; {{part}}();' > part.scad
+	openscad --backend Manifold -o {{part}}.stl part.scad
+	rm part.scad
diff --git a/receptacle.scad b/models/receptacle.scad
similarity index 100%
rename from receptacle.scad
rename to models/receptacle.scad
diff --git a/receptacle.stl b/models/receptacle.stl
similarity index 100%
rename from receptacle.stl
rename to models/receptacle.stl