[OpenSCAD] Origami ship has Manifold problem

kitwallace kit.wallace at gmail.com
Sun Apr 26 05:38:57 EDT 2015

The following script used in my origami ship
http://www.thingiverse.com/thing:753562 generates STL which RepetierHost
finds is not manifold - any ideas as to why?
/*   origami ship   Kit Wallace*/// length of bow from centrelb=15; //
height of bowhb=10;// width midshipswm=6; // height midshipshm=3; //
waterline length e.g. from centre eg. half length of bowwl=7.5; // width of
hull from centrewh=4; // height of sailh=15; //Thickness of
paperthickness=1;// sphere qualitysteps = 20;// overall scalescale=3;module
double(axis) {       union() {          children();          mirror(axis)
children();      }  }module plane(s,t=0.5) {    hull()    for (i=[0:len(s)
-1])       translate(s[i]) sphere(t/2);         }
ship_q(t) {   plane([p1,p2,p3],t);   plane([p2,p3,p4],t);  
plane([p4,p2,p5],t);};$fn=steps;scale(scale)  difference() { 
double([0,1,0])      double([1,0,0])          ship_q(thickness);  }

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