diff --git a/scripts/bom.py b/scripts/bom.py
index b359584..06b89d6 100755
--- a/scripts/bom.py
+++ b/scripts/bom.py
@@ -82,7 +82,7 @@ class BOM:
 
     def add_part(self, s):
         args = []
-        match = re.match(r'^(.*?\.stl)\((.*)\)$', s)                             #look for name.stl(...)
+        match = re.match(r'^(.*?\.stl|.*?\.dxf)\((.*)\)$', s)                             #look for name.stl(...) or name.dxf(...)
         if match:
             s = match.group(1)
             args = [match.group(2)]
diff --git a/scripts/render.py b/scripts/render.py
index 160551e..9e35938 100755
--- a/scripts/render.py
+++ b/scripts/render.py
@@ -81,7 +81,8 @@ def render(target, type):
         #
         if mtime(part_file) > mtime(png_name):
             png_maker_name = "png.scad"
-            colour = [0, 146/255, 0]
+            pp1 = [0, 146/255, 0]
+            colour = pp1
             if part in colours:
                 colour = colours[part]
                 if not '[' in colour:
@@ -89,7 +90,7 @@ def render(target, type):
             with open(png_maker_name, "w") as f:
                 f.write('color(%s) import("%s");\n' % (colour, part_file))
             cam = "--camera=0,0,0,70,0,315,500" if type == 'stl' else "--camera=0,0,0,0,0,0,500"
-            render = "--preview" if type == 'stl' else "--render"
+            render = "--preview" if type == 'stl' or colour != pp1 else "--render"
             tmp_name = 'tmp.png'
             openscad.run(colour_scheme, "--projection=p", "--imgsize=4096,4096", cam, render, "--autocenter", "--viewall", "-o", tmp_name, png_maker_name);
             do_cmd(("magick "+ tmp_name + " -trim -resize 280x280 -background %s -gravity Center -extent 280x280 -bordercolor %s -border 10 %s"
diff --git a/utils/core/bom.scad b/utils/core/bom.scad
index d19f142..b8e3ca4 100644
--- a/utils/core/bom.scad
+++ b/utils/core/bom.scad
@@ -107,7 +107,7 @@ module stl_colour(colour = pp1_colour, alpha = 1) { //! Colour an stl where it i
         children();
 }
 
-module stl(name) { //! Name an stl that will appear on the BOM, there needs to a module named ```<name>_stl``` to make it
+module stl(name) {                      //! Name an stl that will appear on the BOM, there needs to a module named ```<name>_stl``` to make it
     if(bom_mode()) {
         colour = is_undef($stl_colour) ? pp1_colour : $stl_colour;
         echo(str("~", name, ".stl(colour='", colour, "')"));
@@ -115,8 +115,12 @@ module stl(name) { //! Name an stl that will appear on the BOM, there needs to a
 }
 
 module dxf(name) {                      //! Name a dxf that will appear on the BOM, there needs to a module named ```<name>_dxf``` to make it
-    if(bom_mode())
-        echo(str("~", name, ".dxf"));
+    if(bom_mode()) {
+        if(is_undef($dxf_colour))
+            echo(str("~", name, ".dxf"));
+        else
+            echo(str("~", name, ".dxf(colour='", $dxf_colour, "')"));
+    }
 }
 
 function value_string(value) = is_string(value) ? str("\"", value, "\"") : str(value); //! Convert ```value``` to a string or quote it if it is already a string
diff --git a/vitamins/sheet.scad b/vitamins/sheet.scad
index 5225139..8ec5d43 100644
--- a/vitamins/sheet.scad
+++ b/vitamins/sheet.scad
@@ -83,6 +83,7 @@ module render_sheet(type, colour = false) //! Render a sheet in the correct colo
         render() children();
 
 module render_2D_sheet(type, colour = false) //! Extrude a 2D sheet template and give it the correct colour
-    color(colour ? colour : sheet_colour(type))
-        linear_extrude(sheet_thickness(type), center = true)
-            children();
+    let($dxf_colour = colour ? colour : sheet_colour(type))
+        color($dxf_colour)
+            linear_extrude(sheet_thickness(type), center = true)
+                children();