From a7dde2d4e274865c8fdad6548d351f61d88399c6 Mon Sep 17 00:00:00 2001
From: Chris Palmer <nop.head@gmail.com>
Date: Tue, 24 Mar 2020 17:28:10 +0000
Subject: [PATCH] Fixed short thread bug although threads should not be that
 short.

---
 utils/thread.scad | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/utils/thread.scad b/utils/thread.scad
index 3937415..fc14fc7 100644
--- a/utils/thread.scad
+++ b/utils/thread.scad
@@ -79,7 +79,7 @@ module thread(dia, pitch, length, profile, center = true, top = -1, bot = -1, st
     sides = r2sides4n(r);
     step_angle = 360 / sides;
     segs = ceil(turns * sides);
-    leadin = ceil(sides / starts);
+    leadin = min(ceil(sides / starts), floor(turns * sides / 2));
     final = floor(turns * sides) - leadin;
     path = [for(i = [0 : segs],
                 R = i < leadin && bot < 0 ? r + dir * (h - h * i / leadin)