From 78e7a2b34a9c3de00742194ccb257da0d40a5713 Mon Sep 17 00:00:00 2001
From: Dejvino <dejvino@gmail.com>
Date: Sun, 17 Jan 2021 16:21:13 +0100
Subject: [PATCH] Add linked strap

---
 strap_link.scad | 84 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 strap_link.scad

diff --git a/strap_link.scad b/strap_link.scad
new file mode 100644
index 0000000..3d60eb7
--- /dev/null
+++ b/strap_link.scad
@@ -0,0 +1,84 @@
+links_count=3;
+
+//validation=1;
+VALIDATE_INTERSECTION=1;
+
+use <BOSL/transforms.scad>
+use <BOSL/shapes.scad>
+include <BOSL/constants.scad>
+
+function get_link_segment_size() = [10, 20, 5];
+function get_link_pin_diameter() = 2;
+
+module link() {
+    segment_size=get_link_segment_size();
+    module pin() {
+        h=segment_size.y;
+        d=get_link_pin_diameter();
+        back(h/2) xrot(90) cylinder(h=h, d=d, $fn=$preview ? 10 : 30);
+    }
+    module pin_socket_area() {
+        h=segment_size.y-3;
+        d=segment_size.z;
+        back(h/2) xrot(90) cylinder(h=h, d=d, $fn=$preview ? 10 : 30);
+    }
+    module pin_socket() {
+        difference() {
+            pin_socket_area();
+            scale(1.1) pin();
+        }
+    }
+    module joiner() {
+        gap=2;
+        module arm() {
+            arm_size=[segment_size.x*0.9, 2, segment_size.z];
+            fwd(segment_size.y/2) right(segment_size.x/4) cuboid(arm_size, fillet=1, edges=EDGES_FRONT + EDGES_Y_ALL);
+        }
+        module armFront() {
+            arm();
+        }
+        module armBack() {
+            scale([1, -1, 1]) arm();
+        }
+        module armJoiner() {
+            joiner_size=[4, segment_size.y, segment_size.z];
+            right(segment_size.x/2) cuboid(joiner_size, fillet=1, edges=EDGES_Z_ALL + EDGES_BOTTOM);
+        }
+        module socketJoiner() {
+            joiner_size=[segment_size.x-4,
+                segment_size.y-4,
+                segment_size.z];
+            difference() {
+                right(segment_size.x/2 + 2.5) cuboid(joiner_size, fillet=1, edges=EDGES_Z_ALL + EDGES_BOTTOM);
+                right(segment_size.x) scale([1, 2, 1]) pin_socket_area();
+            }
+        }
+        socketJoiner();
+        armFront();
+        armBack();
+        armJoiner();
+    }
+    
+    pin();
+    right(segment_size.x) pin_socket();
+    joiner();
+}
+
+segment_size=get_link_segment_size();
+if (!is_undef(validation)) {
+    if (validation==VALIDATE_INTERSECTION) {
+        intersection() {
+            right(0*segment_size.x) link();
+            right(1*segment_size.x) link();
+        }
+        intersection() {
+            right(1*segment_size.x) link();
+            right(2*segment_size.x) link();
+        }
+    }
+} else {
+    for (i = [0:links_count-1]) {
+        right(i*segment_size.x) link();
+    }
+}
+