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- links_count=6;
- include_terminal=true;
-
- //validation=1;
- VALIDATE_INTERSECTION=1;
-
- //xray=1;
-
- use <BOSL/transforms.scad>
- use <BOSL/shapes.scad>
- include <BOSL/constants.scad>
-
- function get_link_segment_size() = [15, 30, 5];
- function get_link_pin_diameter() = 2;
- function get_link_socket_slack() = [1, 4, 1];
- function get_link_joiner_arm_size() = [get_link_segment_size().x - 2, 3, segment_size.z];
- function get_link_socket_size() = [get_link_segment_size().z,
- get_link_segment_size().y - get_link_joiner_arm_size().y*2,
- get_link_segment_size().z];
-
- echo("===============================");
- echo(str("Strap length: ", (links_count * get_link_segment_size().x), " mm"));
- echo("===============================");
-
- assert(get_link_segment_size().x >= 10, "Link segment is too short.");
- assert(get_link_segment_size().z >= (get_link_pin_diameter() + get_link_socket_slack().z + 1), "Link segment is too thin.");
-
- module link(terminal=false) {
- 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-get_link_socket_slack().y;
- 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();
- scaleup = [
- ((get_link_pin_diameter() + get_link_socket_slack().x) / get_link_pin_diameter()),
- ((get_link_pin_diameter() + get_link_socket_slack().y) / get_link_pin_diameter()),
- ((get_link_pin_diameter() + get_link_socket_slack().z) / get_link_pin_diameter())
- ];
- scale(scaleup) pin();
- }
- }
- module joiner() {
- gap=2;
- arm_size=get_link_joiner_arm_size();
- module arm() {
- fwd(segment_size.y/2 + arm_size.y/2 - 1) right(arm_size.x/2 - 1) 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=[arm_size.x-get_link_socket_size().x, segment_size.y, segment_size.z];
- right(joiner_size.x/2 + get_link_socket_size().x/2 + gap) cuboid(joiner_size, fillet=1, edges=EDGES_Z_ALL + EDGES_BOTTOM);
- }
- module socketJoiner() {
- joiner_size=[segment_size.x-get_link_socket_size().x+get_link_socket_size().x*0.2,
- segment_size.y-4,
- segment_size.z];
- difference() {
- right(joiner_size.x/2 + 4.5) cuboid(joiner_size, fillet=1, edges=EDGES_Z_ALL + EDGES_BOTTOM);
- right(segment_size.x) scale([1, 2, 1]) pin_socket_area();
- }
- }
- module terminalArm() {
- left(5) {
- shift=arm_size.x - get_link_pin_diameter();
- right(segment_size.x + shift + gap/2) pin();
- right(segment_size.x + gap/2) {
- armFront();
- armBack();
- }
- right(arm_size.x - get_link_socket_size().x + gap) armJoiner();
- }
- }
- armFront();
- armBack();
- armJoiner();
- if (terminal) {
- terminalArm();
- } else {
- socketJoiner();
- }
- }
-
- pin();
- joiner();
- if (!terminal) {
- right(segment_size.x) pin_socket();
- }
- }
-
- 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 if (!is_undef(xray)) {
- intersection() {
- cube([1000, 1000, 1000]);
- for (i = [0:links_count-1]) {
- right(i*segment_size.x) link();
- }
- }
- } else {
- for (i = [0:links_count-1]) {
- terminal=(i==links_count-1) && include_terminal;
- right(i*segment_size.x) link(terminal=terminal);
- }
- }
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