174 lines
8.5 KiB
OpenSCAD
174 lines
8.5 KiB
OpenSCAD
/*
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* Flagclip - Flag attachment carabine
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*
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* Copyright (C) 2022-23 Matthias Neeracher <microtherion@gmail.com>
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*/
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$fn= $preview ? 32 : 64;
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// Diameter of flagpole wire
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wire_dia = 3.9; // [1.0:0.05:7.0]
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/* [Other Parameters - Tune if Needed] */
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// Thickness (Z)
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thickness = 4.0; // [3.0:0.25:8.0]
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// Width of outer walls
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wall = 4.0; // [2.0:0.25:6.0]
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// Gaps for carabine and spring openings
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gap = 1.0; // [0.5:0.25:2.0]
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/* [Spring Parameters - Tune if Needed] */
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// Spring Center Radius
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spring_center = 3.0; // [2.0:0.5:10.0]
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// Gap Between Inner and Outer Rings
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spring_gap = 3.0; // [1.0:0.5:5.0]
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/* [Carabine Parameters - Tune if Needed] */
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// Aperture Angle of Carabine Loop
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cara_aperture = 45.0; // [30:5:90]
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// Length of Carabine Arm
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cara_arm = 15.0; // [10:5:50]
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/* [Clip Parameters - Tune if Needed] */
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// Width of Inner Gap for Clip
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clip_aper = 2.5; // [1.0:.5:10]
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// Width of Clip at Bottom of Opening
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clip_base = 12.0; // [10.0:50.0]
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// Length of Clip Arm
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clip_arm = 18.0; // [15.0:50.0]
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// Arc of Wire Holder
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clip_arc = 290; // [190.0:10:330]
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// Width of Wire Holder Walls
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clip_wall = 2.0; // [1.0:0.25:4.0]
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// Clearance of Gap from Edge of Spring
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clip_clear = 4.0; // [1.0:1.0:10.0]
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// Vertical Displacement of Clip Gap
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clip_lever = 4.0; // [0.0:0.25:6.0]
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function intersect_circle(p0, v, r) =
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let (num = sqrt((r^2-p0[0]^2)*v[1]^2+2*p0[0]*p0[1]*v[0]*v[1]+(r^2-p0[1]^2)*v[0]^2)-p0[1]*v[1]-p0[0]*v[0],
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l = num/(v[1]^2+v[0]^2)) p0+l*v;
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function intersect_lines(p0, v, q0, w) =
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let (l = (-q0[0]*w[1]+p0[0]*w[1]+(q0[1]-p0[1])*w[0])/(v[1]*w[0]-v[0]*w[1])) p0+l*v;
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module flagclip(wire_dia=wire_dia, thickness=thickness, wall=wall,
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spring_center=spring_center, spring_gap=spring_gap,
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cara_aperture=cara_aperture, cara_arm=cara_arm,
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gap=gap,
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clip_aper=clip_aper, clip_base=clip_base, clip_arm=clip_arm,
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clip_arc=clip_arc, clip_wall=clip_wall, clip_clear=clip_clear,
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clip_lever=clip_lever)
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{
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spring_inner_in_r = spring_center;
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spring_inner_out_r = spring_inner_in_r + wall;
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spring_outer_in_r = spring_inner_out_r + spring_gap;
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spring_outer_out_r = spring_outer_in_r + wall;
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cara_ratio_r = [sin(0.5*cara_aperture), cos(0.5*cara_aperture)];
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cara_ratio_out_r = [cos(0.5*cara_aperture), -sin(0.5*cara_aperture)];
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cara_inner_bot_r = [0.5*spring_gap, spring_outer_in_r*cos(asin(0.5*spring_gap/spring_outer_in_r))];
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cara_inner_top_r = cara_inner_bot_r+cara_arm*cara_ratio_r;
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cara_outer_top_r = cara_inner_top_r+wall*cara_ratio_out_r;
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cara_outer_top_rp = cara_inner_top_r+(wall+1)*cara_ratio_out_r;
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cara_outer_bot_r = cara_outer_top_r-(cara_arm-0.5*wall)*cara_ratio_r;
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cara_ratio_l = [-sin(0.5*cara_aperture), cos(0.5*cara_aperture)];
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cara_ratio_out_l = [-cos(0.5*cara_aperture), -sin(0.5*cara_aperture)];
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cara_inner_bot_l = [-cara_inner_bot_r[0], cara_inner_bot_r[1]];
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cara_inner_top_l = cara_inner_bot_l+cara_arm*cara_ratio_l;
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cara_outer_top_l = cara_inner_top_l+wall*cara_ratio_out_l;
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cara_outer_top_lp = cara_inner_top_l+(wall+1)*cara_ratio_out_l;
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cara_outer_bot_l = cara_outer_top_l-(cara_arm-0.5*wall)*cara_ratio_l;
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cara_inner_gap_l = cara_inner_bot_l+(cara_arm-gap)*cara_ratio_l;
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cara_outer_gap_l = cara_inner_gap_l+wall*cara_ratio_out_l;
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cara_loop_center = [0,cara_inner_top_r[1]];
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cara_loop_in_r = cara_inner_top_r[0];
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cara_loop_out_r = cara_loop_in_r+wall;
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clip_half_aperture = asin(0.5*(clip_base-clip_aper)/clip_arm);
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clip_ratio_r = [sin(clip_half_aperture), -cos(clip_half_aperture)];
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clip_ratio_out_r = [-clip_ratio_r[1], clip_ratio_r[0]];
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clip_inner_in_r = [0.5*clip_aper, -spring_inner_in_r*cos(asin(0.5*clip_aper/spring_inner_in_r))];
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clip_inner_in_l = [-clip_inner_in_r[0], clip_inner_in_r[1]];
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clip_inner_out_r = [0.5*clip_aper, -spring_inner_out_r*cos(asin(0.5*clip_aper/spring_inner_out_r))];
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clip_inner_out_l = [-clip_inner_out_r[0], clip_inner_out_r[1]];
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clip_bot_in_r = clip_inner_out_r+clip_arm*clip_ratio_r;
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clip_bot_out_r = clip_bot_in_r+wall*clip_ratio_out_r;
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clip_inner_r = clip_bot_out_r-(clip_arm+0.5*wall)*clip_ratio_r;
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clip_inner_inter_r = intersect_circle(clip_inner_r, clip_ratio_r, spring_inner_out_r);
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clip_ratio_l = [-clip_ratio_r[0], clip_ratio_r[1]];
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clip_ratio_out_l = [clip_ratio_l[1], -clip_ratio_l[0]];
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clip_bot_in_l = clip_inner_out_l+clip_arm*clip_ratio_l;
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clip_bot_out_l = clip_bot_in_l+wall*clip_ratio_out_l;
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clip_inner_l = clip_bot_out_l-(clip_arm+0.5*wall)*clip_ratio_l;
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clip_outer_inter_l = intersect_circle(clip_inner_l, clip_ratio_l, spring_outer_out_r);
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clip_inner_inter_l = intersect_circle(clip_inner_l, clip_ratio_l, spring_inner_out_r);
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clip_outer_gap_t = clip_outer_inter_l+clip_clear*clip_ratio_l;
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clip_outer_gap_b = clip_outer_gap_t+gap*clip_ratio_l;
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clip_inner_gap_t = clip_outer_gap_t-wall*clip_ratio_out_l-clip_lever*clip_ratio_l;
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clip_inner_gap_b = clip_inner_gap_t+gap*clip_ratio_l;
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wire_center = [0, clip_bot_in_r[1]+0.5*wire_dia];
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clip_angle = 180-0.5*clip_arc;
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wire_ratio = [sin(clip_angle), cos(clip_angle)];
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wire_out_r = clip_wall*[wire_ratio[1], -wire_ratio[0]];
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clip_wire_inter_r = intersect_lines(clip_bot_in_r, clip_ratio_r, wire_center, wire_ratio);
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clip_wire_inter_l = [-clip_wire_inter_r[0], clip_wire_inter_r[1]];
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wire_out_l = clip_wall*[-wire_ratio[1], -wire_ratio[0]];
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linear_extrude(height=thickness) {
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/* Spring */
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difference() {
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union() {
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difference() {
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circle(r = spring_outer_out_r);
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circle(r = spring_outer_in_r);
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}
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circle(r = spring_inner_out_r);
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translate([-spring_outer_in_r-1,-0.5*wall,0])
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square(size=[2*spring_outer_in_r+2, wall]);
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}
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circle(r = spring_inner_in_r);
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/* Opening for Carabine */
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polygon(points=[cara_inner_bot_r, cara_inner_top_r, cara_inner_top_l, cara_inner_bot_l]);
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/* Opening for Clip */
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polygon(points=[clip_inner_in_l, clip_inner_out_l, clip_bot_in_l, clip_bot_in_r, clip_inner_out_r, clip_inner_in_r]);
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polygon(points=[clip_inner_gap_b, clip_inner_gap_t, clip_outer_gap_t, clip_outer_gap_b]);
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}
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/* Carabine */
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difference() {
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translate(cara_loop_center) circle(r = cara_loop_out_r);
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translate(cara_loop_center) circle(r = cara_loop_in_r);
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polygon(points=[cara_outer_top_rp, cara_inner_top_r, cara_loop_center, cara_inner_top_l, cara_outer_top_lp, [cara_outer_top_l[0], 0], [cara_outer_top_r[0], 0]]);
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}
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polygon(points=[cara_outer_bot_r, cara_outer_top_r, cara_inner_top_r, cara_inner_bot_r]);
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polygon(points=[cara_outer_bot_l, cara_outer_gap_l, cara_inner_gap_l, cara_inner_bot_l]);
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/* Clip */
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difference() {
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translate(clip_bot_in_r) circle(r=wall);
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translate([clip_bot_in_r[0]-wall, clip_bot_in_r[1]-wall]) square(size=[wall, 2*wall]);
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}
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polygon(points=[clip_bot_in_r, clip_bot_out_r, clip_inner_inter_r, clip_inner_out_r]);
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difference() {
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translate(clip_bot_in_l) circle(r=wall);
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translate([clip_bot_in_l[0], clip_bot_in_r[1]-wall]) square(size=[wall, 2*wall]);
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}
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difference() {
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polygon(points=[clip_bot_in_l, clip_inner_out_l, clip_inner_inter_l, clip_bot_out_l]);
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polygon(points=[clip_inner_gap_b, clip_inner_gap_t, clip_outer_gap_t, clip_outer_gap_b]);
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}
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translate([clip_bot_in_l[0], clip_bot_in_l[1]-wall]) square(size=[clip_base, wall]);
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difference() {
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union() {
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translate(wire_center) circle(r=0.5*wire_dia+clip_wall);
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polygon(points=[wire_center, wire_center+wire_out_r, clip_wire_inter_r+wire_out_r, clip_wire_inter_r]);
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polygon(points=[wire_center, clip_wire_inter_l, clip_wire_inter_l+wire_out_l, wire_center+wire_out_l]);
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}
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translate(wire_center) circle(r=0.5*wire_dia);
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polygon(points=[wire_center, clip_wire_inter_r, clip_wire_inter_l]);
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translate(clip_wire_inter_l) square([clip_base, wall]);
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}
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}
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}
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flagclip();
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