1 files changed, 3 insertions, 2 deletions

diff --git a/mold.scad b/mold.scad
index d5354b0..e4f93fc 100644
--- a/mold.scad
+++ b/mold.scad
@@ -3,3 +3,3 @@ module mold(
                 s=1,    /* shell thickness */
-                h_protrude=5,/* how far to protrude outside horizontally */
+                h_protrude=-1,/* how far to protrude outside horizontally, default is size[2] */
                 v_protrude=10,/* and vertically */
@@ -25,3 +25,4 @@ module mold(
  gw = 3*s; // guide width, in case I'll want to change it.
- module trusion(in) {
+ h_protrude_ = h_protrude<0 ? size[2] : h_protrude;
+ module trusion(in,gw=gw,h_protrude=h_protrude_) {
   translate([-gw/2,0,s+size[2]]) union() {