From f43e11317255f663efef52f064c0a91fd7ea8c1b Mon Sep 17 00:00:00 2001
From: lumbric <lumbric@gmail.com>
Date: Mon, 1 Feb 2016 00:10:04 +0100
Subject: [PATCH] improve imprecise constant for hexagon shape

1.75 is a very bad aproximation for 1.732050807568877 = cos(30) * 2. I don't think we need to optimize here and hardcode the constant - better use a readable calculation.
---
 shapes.scad | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/shapes.scad b/shapes.scad
index 84b1810c..4c06b4f0 100644
--- a/shapes.scad
+++ b/shapes.scad
@@ -82,7 +82,7 @@ module ovalTube(height, rx, ry, wall, center = false) {
 
 // size is the XY plane size, height in Z
 module hexagon(size, height) {
-  boxWidth = size/1.75;
+  boxWidth = (size / 2.) / cos(30.);
   for (r = [-60, 0, 60]) rotate([0,0,r]) cube([boxWidth, size, height], true);
 }