diff --git a/Makefile b/Makefile
index f2e7208..f88d7d5 100644
--- a/Makefile
+++ b/Makefile
@@ -67,3 +67,8 @@ vis: build/assembly.scad
 build/testwing-clear.scad: build/testwing.scad
 	sed 's/color("clear-red")/color([1.0,1.0,0.0,0.9])/g' $< > $@
 	sed 's/color("clear-blue")/color([0.0,1.0,1.0,1.0])/g' -i $@
+
+build/assembly-clear.scad: build/assembly.scad
+	sed 's/color("clear-red")/color([1.0,0.0,0.0,0.9])/g' $< > $@
+	sed 's/color("clear-blue")/color([0.0,1.0,0.0,0.9])/g' -i $@
+	sed 's/color("clear-blue")/color([0.0,0.0,1.0,0.9])/g' -i $@
diff --git a/src/main.rs b/src/main.rs
index a872d40..eb371aa 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,9 +1,6 @@
-use std::sync::Mutex;
-
 use constants::*;
 use nalgebra::Vector3;
 use scad::*;
-use selig::Point;
 use selig::SeligFile;
 use selig::Span;
 use std::ops::Range;
@@ -37,6 +34,11 @@ fn main() {
 
     let wing_transform = mirrored_wing(&wing_airfoil, &WING);
 
+    let mut wing_spar = ScadFile::new();
+    let wing_spar_outline = wing_transform.parts.last().unwrap().clone();
+    wing_spar.add_object(wing_spar_outline);
+    wing_spar.write_to_file("build/wingspar.scad".to_string());
+
     // spars
 
     // "fuselage"
@@ -147,12 +149,12 @@ fn mirrored_wing(wing_airfoil: &SeligFile, wing_config: &WingConfig) -> Construc
         wing_transform.add_child(wing);
     }
     // fuselage affixment point
+    wing_transform.add_child(symetric_spar.clone());
     symetric_spar.add_child(centered_cube(
         vec3(CHORD, FUSELAGE_GAP * 2.0, 1.0),
         (false, true, false),
     ));
     parts.push(scad!(Projection(false); symetric_spar.clone()));
-    wing_transform.add_child(symetric_spar);
     Construct::new(
         wing_transform.clone()
         , parts)
@@ -162,7 +164,7 @@ fn mirrored_wing(wing_airfoil: &SeligFile, wing_config: &WingConfig) -> Construc
 fn wing(wing_airfoil: &SeligFile, wing_config: &WingConfig, spar: SparType) -> (Construct, Construct) {
     let (wing, wing_parts) = wing_struts(
         wing_airfoil,
-        &wing_config,
+        wing_config,
         &spar,
     ).tup();
     // TODO: other spar types
@@ -350,7 +352,7 @@ fn wing_struts(
 
         let mut transform = scad!(Translate(vec3(0.0, spacing, 0.0)));
 
-        let mut strut = strut(aerofoil, chord, CARDBOARD_WIDTH, &spar);
+        let mut strut = strut(aerofoil, chord, CARDBOARD_WIDTH, spar);
         transform.add_child(strut.visualization);
         parts.append(strut.parts.as_mut());
         wing.add_child(transform);
@@ -365,7 +367,6 @@ fn topwing_spar(
 ) -> ScadObject {
     let mut wing = scad!(Hull);
 
-    let mut last_segment: Option<ScadObject> = None;
     let mut pre_vis = scad!(Union);
 
     // struts
@@ -382,26 +383,7 @@ fn topwing_spar(
         let mut transform = scad!(Translate(vec3(0.0, spacing, 0.0)));
         transform.add_child(extruded);
 
-        // in betweens
-        if let Some(last) = last_segment {
-            let mut hull = scad!(Hull);
-            let extrude = LinExtrudeParams {
-                height: 0.01,
-                center: true,
-                ..Default::default()
-            };
-
-            let mut last_t = scad!(Translate(vec3(0.0, -gap, 0.0)));
-            last_t.add_child(scad!(LinearExtrude(extrude.clone()); last));
-            //hull.add_child(last_t);
-            //hull.add_child(scad!(LinearExtrude(extrude); shape.clone()));
-
-            transform.add_child(hull);
-        }
-
         pre_vis.add_child(transform);
-
-        last_segment = Some(shape);
     }
 
     wing.add_child(pre_vis);