From 66ee4d791039758827518a354b2d964348c863b6 Mon Sep 17 00:00:00 2001
From: Michael Krelin <hacker@klever.net>
Date: Wed, 25 Jul 2018 21:42:12 +0000
Subject: add liner tolerance

---
diff --git a/multimixer.scad b/multimixer.scad
index 80f41f1..c7b3489 100644
--- a/multimixer.scad
+++ b/multimixer.scad
@@ -14,6 +14,8 @@ module multimixer(
  pf = pushfit_embeddest,
  debug = 0,     // how many inputs -1 the debug cutout spans
  print = false,
+
+ liner_d_tolerance=.2
 ) {
  fnd = 4*PI; fnr = 2*fnd;
  
@@ -22,13 +24,14 @@ module multimixer(
  
  angular_step = 360/inputs;
  inputogon_angle = 180*(inputs-2)/inputs;
+ lod = liner_od+liner_d_tolerance; // effective liner diameter
  
  sinsin = sin(angle)*sin(angular_step/2);
  function l_to(d) = d*cos(asin(sinsin))/sinsin;
- l_output = liner_od;
+ l_output = lod;
  l_input = l_to(pushfit_d/2+minshell);
  l_fork = l_to(liner_id/2);
- l_narrow = l_to(liner_od/2+minshell);
+ l_narrow = l_to(lod/2+minshell);
  
  module forinputs() {
   for(zr=[0:angular_step:359]) rotate([0,0,zr]) rotate([0,angle,0]) children();
@@ -76,15 +79,15 @@ module multimixer(
   forinputs() {
    translate([0,0,l_input]) pushfit(pf);
    translate([0,0,l_narrow]) {
-    cylinder(d=liner_od,h=l_input+1-l_narrow,$fn=liner_od*fnd);
+    cylinder(d=lod,h=l_input+1-l_narrow,$fn=lod*fnd);
     mirror([0,0,1]) translate([0,0,-epsilon])
-    cylinder(d1=(liner_id+liner_od)/2,d2=liner_id,h=liner_id,$fn=liner_od*fnd);
+    cylinder(d1=(liner_id+lod)/2,d2=liner_id,h=liner_id,$fn=lod*fnd);
    }
    cylinder(d=liner_id,h=l_input+epsilon,$fn=liner_id*fnd);
   }
   foroutput() {
    translate([0,0,l_output]) pushfit(pf);
-   cylinder(d=liner_od,h=l_input+1,$fn=liner_od*fnd);
+   cylinder(d=lod,h=l_output+1,$fn=lod*fnd);
   }
   hull() {
    forinputs()
--
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