From 00521289f3af4922ecd919de1f13143fcda4348b Mon Sep 17 00:00:00 2001
From: Justin Lin <caterpillar@openhome.cc>
Date: Thu, 26 Sep 2019 11:35:39 +0800
Subject: [PATCH] diff directly

---
 src/part/joint_T.scad | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/part/joint_T.scad b/src/part/joint_T.scad
index fa69a160..912bcbb3 100644
--- a/src/part/joint_T.scad
+++ b/src/part/joint_T.scad
@@ -1,8 +1,10 @@
 module joint_T(shaft_r, shaft_h, t_leng, ring_thickness, spacing = 0.5, center = false) {
     ring_r = shaft_r + spacing + ring_thickness;
     module joint_ring() {
-        hollow_out(ring_thickness)
+        difference() {
             circle(ring_r);
+            circle(ring_r - ring_thickness);
+        }
     }
 
     half_h = shaft_h / 2;