diff --git a/Makefile b/Makefile
index d9aff11..bbff511 100644
--- a/Makefile
+++ b/Makefile
@@ -61,8 +61,8 @@ clean:
 	rm *.dat
 	cargo clean
 
-vis: build/assembly.scad
-	openscad build/assembly.scad
+vis: build/assembly-clear.scad
+	openscad build/assembly-clear.scad
 
 build/testwing-clear.scad: build/testwing.scad
 	sed 's/color("clear-red")/color([1.0,1.0,0.0,0.9])/g' $< > $@
diff --git a/src/main.rs b/src/main.rs
index e842af4..e2d1a01 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -80,11 +80,12 @@ fn main() {
         let mut file = ScadFile::new();
         file.set_detail(50);
         file.add_object(part);
-        file.write_to_file(format!("build/part{idx}.scad"));
+        file.write_to_file(format!("build/part{idx:0>3}.scad"));
     }
 
     // all parts in one file
     let mut allparts = ScadFile::new();
+    parts.push(scad!(Square(vec2(STOCK_WIDTH, STOCK_HEIGHT))));
     allparts.set_detail(50);
     for (idx, part) in parts.into_iter().enumerate() {
         allparts.add_object(scad!(Translate2d(vec2(0.0, INF * idx as f32)); part));