239 lines
7.5 KiB
OpenSCAD
239 lines
7.5 KiB
OpenSCAD
// LEGO-like parametric tire...
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// (c) Vitaliy Filippov 2014, license: CC-BY-SA 4.0
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$fn=60;
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// 81.6x50:
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// rim offset is (SPOKE_THICKNESS+(R_I-SPACING-RIM_THICKNESS-CUT_BASE)/2),
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// so offset=4mm if SPOKE_THICKNESS=12.85
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R=40.8; // outer radius
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R_I=26.5; // innermost radius
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BEVEL=1;
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BEVEL_OUTER=1.4;
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THICKNESS=1.6;
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BORDER_THICKNESS=1.2;
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PROT_DEPTH=0.5;
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PROT_L_WIDTH=2;
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PROT_A_WIDTH=2;
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FIX_WIDTH=2;
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B=2.5; // width of edge for the rim
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B_W=1.6; // thickness of edge for the rim
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B_P=4; // position of edge for the rim
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W=50; // tire width
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N_L=4; // number of lateral protectors
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N_A=10; // number of angular protectors
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SPOKE_THICKNESS=12.85; // thickness of solid spoke part
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RIM_THICKNESS=2;
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N_SPOKE=9; // number of spokes
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CUT_BASE=8;
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CUT_ANGLE=12;
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CUT_I_R=1.5;
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CUT_O_R=2;
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SPACING=0.6;
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HOLE_RADIUS=2.4; // my Wanhao Duplicator 4 makes no errors with Slic3r, 2.4mm is ideal lego hole
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N_A=0;
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// 6-spoke variant
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N_SPOKE=6;
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CUT_ANGLE=21;
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CUT_I_R=2.5;
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CUT_O_R=2;
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// small
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R=22;
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BEVEL=0.6;
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BEVEL_OUTER=0.8;
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THICKNESS=1.2;
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BORDER_THICKNESS=0.8;
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PROT_DEPTH=0.4;
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SPOKE_THICKNESS=8;
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FIX_WIDTH=1.2;
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PROT_A_WIDTH=1;
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PROT_L_WIDTH=1;
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B_P=3;
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B_W=1;
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B=1.6;
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R_I=15;
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CUT_O_R=1;
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CUT_BASE=5;
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N_L=2;
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N_A=0;
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W=16;
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difference() {
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union() {
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rim();
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difference() {
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tire();
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// first layer usually becomes slightly bigger...
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difference() {
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cylinder(r=R, h=0.3);
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translate([0, 0, -0.1]) cylinder(r=R-BEVEL_OUTER-0.2, h=1);
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}
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}
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/*
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// "Manual support material" needed to print tire
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difference() {
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hull() {
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cylinder(r=R_I+B-0.2, h=B_P-0.2-(BEVEL-0.2*(2-sqrt(2))));
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cylinder(r=R_I+B-0.2-(BEVEL-0.2*(2-sqrt(2))), h=B_P-0.2);
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}
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translate([0, 0, -0.1]) cylinder(r=R_I+B-0.2-2, h=B_P);
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}
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translate([0, 0, B_P+B_W+0.3])
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difference() {
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cylinder(r=R_I+B+THICKNESS, h=W-2*(B_P+B_W+0.3));
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cylinder(r=R_I, h=W);
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}*/
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}
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// to cut and look inside :)
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translate([0, 0, -0.5]) cube(size=[R+10, R+10, W+1]);
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}
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module rim() {
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V_SPACING=0.2;
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color([0.5, 0.5, 1]) {
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difference() {
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union() {
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cylinder(r=R_I-SPACING, h=W);
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// outer fixing edges
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cylinder(r=R_I+B-SPACING, h=FIX_WIDTH+(B_P-FIX_WIDTH-V_SPACING));
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translate([0, 0, W-(B_P-FIX_WIDTH-V_SPACING)-FIX_WIDTH])
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cylinder(r=R_I+B-SPACING, h=FIX_WIDTH+(B_P-FIX_WIDTH-V_SPACING));
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}
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// make spokes by cutting space between them
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for (i = [1 : N_SPOKE])
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rotate([0, 0, i*360/N_SPOKE]) rim_cut();
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// cut spokes toroidally inside the rim
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translate([0, 0, W-SPOKE_THICKNESS-(R_I-SPACING-RIM_THICKNESS-CUT_BASE)/2])
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rotate_extrude(convexity = 10)
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translate([(R_I-SPACING-RIM_THICKNESS-CUT_BASE)/2+CUT_BASE, 0, 0])
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circle(r = (R_I-SPACING-RIM_THICKNESS-CUT_BASE)/2);
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// remove the rest of spokes
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cylinder(r=R_I-SPACING-RIM_THICKNESS, h=W-SPOKE_THICKNESS-(R_I-SPACING-RIM_THICKNESS-CUT_BASE)/2);
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// add axle hole at the center
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translate([0, 0, -0.5]) linear_extrude(height=W+1) axle();
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// add center cut around axle hole
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translate([0, 0, W-(B_P-FIX_WIDTH-SPACING)-4]) cylinder(r=CUT_BASE-2, h=5);
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// make spokes convex using another toroidal cut
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difference() {
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translate([0, 0, W-(B_P-FIX_WIDTH-V_SPACING)]) cylinder(r=1+R_I+B-0.5/*R_I-2*/, h=1+(B_P-FIX_WIDTH-V_SPACING));
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translate([0, 0, W-(B_P-FIX_WIDTH-V_SPACING)])
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scale([1, 1, (B_P-FIX_WIDTH-V_SPACING)/((R_I-SPACING-RIM_THICKNESS-CUT_BASE+2)/2)])
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rotate_extrude(convexity = 10)
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translate([(R_I-SPACING-CUT_BASE)/2+CUT_BASE-RIM_THICKNESS, 0, 0]) circle(r = (R_I-SPACING-CUT_BASE)/2);
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}
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// remove the rest symmetrically
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translate([0, 0, -1]) cylinder(r=1+R_I+B-0.5, h=1+(B_P-FIX_WIDTH-V_SPACING));
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}
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}
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}
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module rim_cut() {
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in_angle = atan((R_I-SPACING-RIM_THICKNESS)*sin(CUT_ANGLE)/((R_I-SPACING-RIM_THICKNESS)*cos(CUT_ANGLE)-CUT_BASE-CUT_I_R));
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translate([0, 0, -0.5]) linear_extrude(height=W+1) {
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hull() {
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translate([CUT_BASE+CUT_I_R, 0]) circle(r=CUT_I_R);
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rotate([0, 0, CUT_ANGLE]) translate([R_I-SPACING-RIM_THICKNESS-CUT_O_R, 0, 0]) circle(r=CUT_O_R);
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rotate([0, 0, -CUT_ANGLE]) translate([R_I-SPACING-RIM_THICKNESS-CUT_O_R, 0, 0]) circle(r=CUT_O_R);
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}
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difference() {
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circle(r=R_I-SPACING-RIM_THICKNESS);
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translate([CUT_BASE+CUT_I_R, 0]) rotate([0, 0, in_angle]) translate([-50, 0]) square(size=[100, 100]);
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translate([CUT_BASE+CUT_I_R, 0]) rotate([0, 0, -in_angle]) translate([-50, -100]) square(size=[100, 100]);
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}
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}
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}
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module tire() {
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b_i = BEVEL;
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bo_i = max(BEVEL, BEVEL_OUTER-THICKNESS*(2-sqrt(2)));
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difference() {
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hull() {
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translate([0, 0, BEVEL_OUTER]) cylinder(r=R, h=W-BEVEL_OUTER*2);
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cylinder(r=R-BEVEL_OUTER, h=W);
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}
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// center hole through all piece
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translate([0, 0, -0.5]) cylinder(r=R_I, h=W+1);
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// top hole
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hull() {
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translate([0, 0, W-B_P+BEVEL]) cylinder(r=R_I+B, h=B_P+1);
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translate([0, 0, W-B_P]) cylinder(r=R_I+B-BEVEL, h=B_P+1);
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}
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hull() {
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translate([0, 0, W-BEVEL]) cylinder(r=R_I+B, h=BEVEL);
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translate([0, 0, W]) cylinder(r=R_I+B+BEVEL, h=1);
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}
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// bottom hole
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hull() {
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translate([0, 0, -1]) cylinder(r=R_I+B-BEVEL, h=B_P+1);
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translate([0, 0, -1]) cylinder(r=R_I+B, h=B_P+1-BEVEL);
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}
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hull() {
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translate([0, 0, 0]) cylinder(r=R_I+B, h=BEVEL);
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translate([0, 0, -1]) cylinder(r=R_I+B+BEVEL, h=1);
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}
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// inside cut
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translate([0, 0, B_P+B_W]) cylinder(r=R-THICKNESS, h=W-(B_P+B_W)*2);
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difference() {
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hull() {
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translate([0, 0, BORDER_THICKNESS]) cylinder(r=R-THICKNESS-bo_i, h=W-BORDER_THICKNESS*2);
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translate([0, 0, BORDER_THICKNESS+bo_i]) cylinder(r=R-THICKNESS, h=W-BORDER_THICKNESS*2-bo_i*2);
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}
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cylinder(r=R_I+B+THICKNESS, h=W);
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translate([0, 0, W-BORDER_THICKNESS-b_i])
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linear_extrude(height=b_i, scale=(R_I+B+THICKNESS+b_i)/(R_I+B+THICKNESS))
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circle(r=R_I+B+THICKNESS);
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translate([0, 0, BORDER_THICKNESS])
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linear_extrude(height=b_i, scale=(R_I+B+THICKNESS)/(R_I+B+THICKNESS+b_i))
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circle(r=R_I+B+THICKNESS+b_i);
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}
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// lateral protector
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if (N_L > 0) for (i = [1 : N_L])
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translate([0, 0, -PROT_L_WIDTH/2+i*W/(N_L+1)])
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difference() {
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cylinder(r=R+1, h=PROT_L_WIDTH);
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translate([0, 0, -0.01]) linear_extrude(height=PROT_L_WIDTH/2+0.01, scale=(R-PROT_DEPTH)/(R+0.01)) circle(r=R+0.01);
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translate([0, 0, PROT_L_WIDTH]) rotate([180, 0, 0]) translate([0, 0, -0.01]) linear_extrude(height=PROT_L_WIDTH/2+0.01, scale=(R-PROT_DEPTH)/(R+0.01)) circle(r=R+0.01);
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translate([0, 0, -0.1]) cylinder(r=R-PROT_DEPTH, h=PROT_L_WIDTH+0.2);
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}
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// angular protector
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if (N_A > 0) for (i = [1 : N_A])
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rotate([0, 0, 360/N_A*i]) protector_angular();
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}
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}
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module protector_angular() {
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difference() {
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union() {
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translate([(W/2)/2, 0, W/2]) rotate([0, -45, 0])
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cube(size=[PROT_A_WIDTH, R+4, sqrt((W/2)*(W/2)*2)]);
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translate([-(W/2)/2, 0, 0]) rotate([0, 45, 0])
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cube(size=[PROT_A_WIDTH, R+4, PROT_A_WIDTH+sqrt((W/2)*(W/2)*2)]);
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}
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translate([0, 0, -0.5]) cylinder(r=R-PROT_DEPTH, h=W+1);
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}
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}
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module axle() {
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axle_gap = 1.95;
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union() {
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translate([-HOLE_RADIUS, -axle_gap/2, 0])
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roundedRect(HOLE_RADIUS * 2, axle_gap, .2);
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translate([-axle_gap/2, -HOLE_RADIUS, 0])
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roundedRect(axle_gap, HOLE_RADIUS * 2, .2);
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}
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}
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module roundedRect(x, y, radius) {
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hull() {
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translate([radius, radius, 0]) circle(r=radius);
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translate([x - radius, radius, 0]) circle(r=radius);
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translate([x - radius, y - radius, 0]) circle(r=radius);
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translate([radius, y - radius, 0]) circle(r=radius);
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}
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}
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