From 8bae1769278db5a6992f39ccb054a0b2ae0383c8 Mon Sep 17 00:00:00 2001
From: Justin Lin <caterpillar@openhome.cc>
Date: Sat, 14 Mar 2020 15:36:01 +0800
Subject: [PATCH] fix orientation when SPI_DOWN & CLK

---
 src/helix_extrude.scad | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/helix_extrude.scad b/src/helix_extrude.scad
index 19049802..1082070d 100644
--- a/src/helix_extrude.scad
+++ b/src/helix_extrude.scad
@@ -28,7 +28,8 @@ module helix_extrude(shape_pts, radius, levels, level_dist,
     r_dir = rt_dir == "CT_CLK" ? 1 : -1;
             
     angle_step = 360 / frags * r_dir;
-    initial_angle = atan2(level_dist / frags, PI * 2 * init_r / frags) * v_dir * r_dir;
+    initial_angle = atan2(level_dist / frags, PI * 2 * init_r / frags) * v_dir * r_dir + 
+                    v_dir == "SPI_DOWN" && r_dir == "CLK" ? 45 : 0;
 
     path_points = helix(
         radius = radius,