Rubber stopper for JK projector reels

models/rubber_stopper_jk_projector/rubber_stopper_jk_projector.scad

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+/**
+ * Rubber Stopper for JK Projector Reels
+ *
+ * To be used as a negative in a 2-part mold to cast stoppers
+ * in rubber or silicone.
+ **/
+ 
+ time=0;
+ 
+ module rubber_stopper_jk_projector () {
+    OD = 19;
+    ID = 6.57;
+    H = 23;
+    TRIANGLE = 9.44 +2.5;
+    ROUND_D = 2;
+
+    $fn = 120;
+
+    difference () {
+        //outer cylinder
+        cylinder(r = OD / 2, h = H, center = true);
+        //rounded corners
+        for (i = [0 : 2]) {
+            rotate([0, 0, 120 * i]) {
+                translate ([(TRIANGLE / 2) - (ROUND_D), 0, 0]) {
+                    cylinder(r = ROUND_D / 2, h = H + 1, center = true);
+                }
+            }
+        }
+        //triangle 
+        difference () {
+            cylinder(r = TRIANGLE / 2, h = H + 1, center = true, $fn = 3);
+            for (i = [0 : 2]) {
+                rotate([0, 0, 120 * i]) {
+                    translate ([(TRIANGLE / 2) - .5, 0, 0]) {
+                        cube([ROUND_D, ROUND_D, H + 1], center = true);
+                    }
+                }
+            }
+        }
+    } 
+ }
+ 
+ //reference
+ //cylinder(r = 6.57 / 2, h = 50, center = true, $fn=60);
+ rotate([0, 0, time]) rubber_stopper_jk_projector();