mold: default value for horizontal protrusion.

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
@@ -1,48 +1,49 @@
 module mold(
 	size,		/* mold inner size */
 	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 */
 	l_intrude=0,	/* how far to intrude on the left */
 	r_intrude=0,	/* how far to intrude on the right */
 	f_intrude=0,	/* how far to intrude on the front */
 	introffset,	/* offset from the front of the left and right intrusions */
         chamfer=1
 ) {
  difference() {
   cube(size=[size[0]+2*s,size[1]+2*s,size[2]+s]);
   translate([s,s,s]) {
    hull() {
     translate([chamfer,0,chamfer])
     cube(size=[size[0]-2*chamfer,size[1],size[2]-2*chamfer]);
     translate([0,chamfer,chamfer])
     cube(size=[size[0],size[1]-2*chamfer,size[2]-2*chamfer]);
     translate([chamfer,chamfer,0])
     cube(size=[size[0]-2*chamfer,size[1]-2*chamfer,size[2]+1]);
    }
   }
  }
  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() {
    hull() {
     translate([0,0,in])
     cube(size=[gw,in+s,v_protrude-in]);
     cube(size=[gw,s,in]);
    }
    hull() {
     translate([0,0,-h_protrude])
     cube(size=[gw,s,v_protrude+h_protrude]);
     translate([0,-h_protrude,0])
     cube(size=[gw,s+h_protrude,v_protrude]);
    }
   }
  }
  /* frontal guide */
  translate([s+size[0]/2,0,]) trusion(in=f_intrude);
  /* left guide */
  translate([0,s+introffset,0]) rotate([0,0,-90]) trusion(in=l_intrude);
  /* right guide */
  translate([size[0]+2*s,s+introffset,0]) rotate([0,0,90]) trusion(in=r_intrude);
 }
 /* vim:set ai sw=1: */