Drag chain ends now pp3_colour and explode.
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@ -243,7 +243,8 @@ module drag_chain_link(type, start = false, end = false) { //! One link of the c
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//! 1. Clip the links together with the special ones at the ends.
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module drag_chain_assembly(type, pos = 0) { //! Drag chain assembly
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s = drag_chain_size(type);
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r = drag_chain_radius(type);
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x = (1 + exploded()) * s.x;
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r = drag_chain_radius(type) * x / s.x;
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travel = drag_chain_travel(type);
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links = ceil(travel / s.x);
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actual_travel = links * s.x;
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@ -255,10 +256,10 @@ module drag_chain_assembly(type, pos = 0) { //! Drag chain assembly
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points = [ // Calculate list of hinge points
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for(i = 0, p = [0, 0, z / 2 + 2 * r]; i < links + 5;
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i = i + 1,
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dx = p.z > c.z ? s.x : -s.x,
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dx = p.z > c.z ? x : -x,
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p = max(p.x + dx, p.x) <= c.x ? p + [dx, 0, 0] // Straight sections
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: let(q = circle_intersect(p, s.x, c, r))
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q.x <= c.x ? [p.x - sqrt(sqr(s.x) - sqr(p.z - zb)), 0, zb] // Transition back to straight
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: let(q = circle_intersect(p, x, c, r))
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q.x <= c.x ? [p.x - sqrt(sqr(x) - sqr(p.z - zb)), 0, zb] // Transition back to straight
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: q) // Circular section
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p
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];
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@ -266,7 +267,7 @@ module drag_chain_assembly(type, pos = 0) { //! Drag chain assembly
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module link(n) // Position and colour link with origin at the hinge hole
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translate([-z / 2, 0, -z / 2])
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stl_colour(n % 2 ? pp1_colour : pp2_colour)
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stl_colour(n < 0 || n == npoints - 1 ? pp3_colour : n % 2 ? pp1_colour : pp2_colour)
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drag_chain_link(type, start = n == -1, end = n == npoints - 1);
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assembly(str(drag_chain_name(type), "_drag_chain")) {
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@ -275,7 +276,7 @@ module drag_chain_assembly(type, pos = 0) { //! Drag chain assembly
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rotate([0, -atan2(v.z, v.x), 0])
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link(i);
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translate(points[0] - [s.x, 0, 0])
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translate(points[0] - [x, 0, 0])
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link(-1);
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translate(points[npoints - 1])
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