include <../libraries/threads.scad>; //https://www.thingiverse.com/thing:186660 include <../libraries/path_extrude.scad>; $fn = 20; H = 9.71; REEL_H = 42; REEL_D = 225.67 + .4; REEL_OUTER_WALL_H = 7.5; REEL_OUTER_WALL_W = 5.9; REEL_INNER_D = 50; REEL_INNER_H = 7.5; REEL_INNER_WALL_W = 20; REEL_MIDDLE_D = ((REEL_D - REEL_INNER_D) / 2) + REEL_INNER_D; REEL_MIDDLE_WALL_H = 7.5; REEL_MIDDLE_WALL_W = 3; SPOKE_COUNT = 24; OD = 10; PITCH = 1.5; THREAD = 1.6; LEN = 21; /** * Frame which the bottom of the spiral reel is mounted to. */ module reel_frame () { //outer wall difference () { cylinder(r = REEL_D / 2, h = REEL_OUTER_WALL_H, center = true); cylinder(r = (REEL_D / 2) - REEL_OUTER_WALL_W, h = REEL_OUTER_WALL_H + 1, center = true); } difference () { cylinder(r = REEL_MIDDLE_D / 2, h = REEL_MIDDLE_WALL_H, center = true); cylinder(r = (REEL_MIDDLE_D / 2) - REEL_MIDDLE_WALL_W, h = REEL_MIDDLE_WALL_H + 1, center = true); } //inner wall difference () { cylinder(r = REEL_INNER_D / 2, h = REEL_INNER_H, center = true); cylinder(r = (REEL_INNER_D / 2) - REEL_INNER_WALL_W, h = REEL_INNER_H + 1, center = true); } //standoff B = 8.15; D = 10.63; OUTER = ((D * 2) + B) / 2; INNER = B / 2; translate ([0, 0, 4]) { difference () { cylinder(r = OUTER, h = 8, center = true); cylinder(r = INNER, h = 8 + 1, center = true); translate([0, 0, -8]) metric_thread (diameter=OD, pitch=PITCH, thread_size = THREAD, length=LEN); } translate([0, 13, 0]) rotate([0, 0, 45]) cube([8, 8, 8], center = true); } //spokes spokes(); rotate([0, 0, 360 / (SPOKE_COUNT * 2)]) { difference() { spokes(); cylinder(r = REEL_MIDDLE_D / 2, h = REEL_MIDDLE_WALL_H + 1, center = true); } } } /** * Spokes structure for the spiral reel frame */ module spokes () { for (i = [0 : SPOKE_COUNT]) { rotate([0, 0, i * (360 / SPOKE_COUNT)]) { translate([0, (REEL_INNER_D / 2) + ((REEL_D - REEL_INNER_D) / 4) - 1, 0]) { cube([3, (REEL_D - REEL_INNER_D) / 2, REEL_OUTER_WALL_H], center = true); } } } } /** * The bottom spiral */ module spiral_bottom_old () { union () { difference () { translate([0, 0, (-(H - REEL_OUTER_WALL_H) / 2) - .05]) reel_frame(); } rotate([0, 0, 270]) scale([-1, 1, 1]) spiral(); } } /** * Only needed for 50ft model, not the current target ATM. */ module spiral_top_old () { union () { difference () { translate([0, 0, (-(H - REEL_OUTER_WALL_H) / 2) - .05]) reel_frame(); } rotate([0, 0, 270]) scale([-1, 1, 1]) spiral(); } } /** * Render all spiral facets for as many rotations as supplied Using new module */ module spiral (START_D = 50, SPIRALS = 39) { //STOP_D = 100; SPACING = 0.86;//1.34; TOP_T = 0.86; //thickness BOTTOM_T = 1.4; START_R = START_D / 2; union () { for (i = [0 : $fn]) { rotate ([0, 0, i * (360 / $fn)]) { for (x = [0: (SPIRALS - 1)]) { spiral_facet(i, x, START_R, SPACING, BOTTOM_T, TOP_T, H); } } } } } /** * Generates a single face of the spiral, in this case a trapazoidal * shape. Issues are (1) performance (maybe use of hull()) and (2) all * facet lenths are the same, despite the diameter. This means that * there are excessive numbers of facets for the smaller spirals to * compensate for the number of facets needed for the outer spiral. */ module spiral_facet (i, x, START_R, SPACING, BOTTOM_T, TOP_T, H) { STEP_SIZE = ((SPACING + BOTTOM_T) / $fn); STEP_OFFSET = i * STEP_SIZE; SPIRAL_START_OFFSET = (x * (SPACING + BOTTOM_T)); ACTUAL_R = START_R + SPIRAL_START_OFFSET + STEP_OFFSET; L = 2 * (ACTUAL_R * tan((360 / $fn) / 2)); ANGLE = -atan( STEP_SIZE / (L / 2) ) / 2; OFFSET = START_R - (BOTTOM_T / 2) + SPIRAL_START_OFFSET + STEP_OFFSET; translate ([OFFSET, 0, - H / 2]) { rotate ([0, 0, ANGLE]) { //replace hull for quick render? //test spiral lib hull () { translate([0, 0, H]) cube([TOP_T, L, 0.1], center=true); cube([BOTTOM_T, L, 0.1], center=true); } } } } /** * Generates an arc with a diameter, width, height and total angle. */ module arc (D, W, H, ANGLE) { R = D / 2; difference () { cylinder(r = R, h = H, center = true); cylinder(r = R - W, h = H + 1, center = true); if (ANGLE <= 90) { translate([-R, -R, 0]) cube([D, D, H + 1], center=true); translate([-R, R, 0]) cube([D, D, H + 1], center=true); translate([R, -R, 0]) cube([D, D, H + 1], center=true); rotate ([0, 0, ANGLE]) { translate([R, R, 0]) { cube([D, D, H + 1], center=true); } } } else if (ANGLE <= 180) { translate([-R, -R, 0]) cube([D, D, H + 1], center=true); translate([R, -R, 0]) cube([D, D, H + 1], center=true); rotate ([0, 0, ANGLE]) { translate([R, R, 0]) { cube([D, D, H + 1], center=true); } } } else if (ANGLE <= 270) { translate([R, -R, 0]) cube([D, D, H + 1], center=true); rotate ([0, 0, ANGLE]) { translate([R, R, 0]) { cube([D, D, H + 1], center=true); } } } else if (ANGLE <= 360) { difference () { union () { difference () { cylinder(r = R + 1, h = H + 1, center = true); cylinder(r = R - W - 1, h = H + 2, center = true); } } scale ([1, -1, 1]) { translate([-R, -R, 0]) cube([D, D, H + 1], center=true); translate([-R, R, 0]) cube([D, D, H + 1], center=true); translate([R, -R, 0]) cube([D, D, H + 1], center=true); rotate ([0, 0, 360 - ANGLE]) { translate([R, R, 0]) { cube([D, D, H + 1], center=true); } } } } } } } module film () { //sample film arc(REEL_D - 4, .5, 16, 100); } module spiral_top_old_debug (half = false, top = false) { difference () { translate([0, 0, 37]) rotate([180, 0, 180]) spiral_top_old(); if (half) { rotate([0, 0, 80]) translate([50, 0, 0]) cube([100, 100, 100], center = true); //half } if (top) { translate([0, 0, 60]) cube([100, 100, 100], center = true); //just top } } } module spiral_bottom_old_debug () { difference () { spiral_bottom_old(); rotate([0, 0, 80]) translate([50, 0, 0]) cube([100, 100, 100], center = true); } } module exploded_view () { spiral_bottom_old(); translate([0, 0, 37 + 15]) rotate([180, 0, 180]) spiral_top_old(); translate([0, 0, -10]) spiral_top_old_cap(); } module spiral_test () { //$fn = 100; //spiral(START_D=34,SPIRALS=8); translate([0, 0, (-(H - REEL_OUTER_WALL_H) / 2) - .05]) { //difference () { intersection() { reel_frame(); cylinder(r = 35, h = H + 20, center = true); } //cylinder(r = 22, h = H, center = true); //} } } module spiral_bottom_core (thread = false) { $fn = 360; core_center_h = 3; core_bottom_outer_d = 53; core_bottom_outer_void_d = 44; core_bottom_outer_h = 4.2; core_d = 29.5; core_h = 8.5; core_bottom_d = 26; core_bottom_h = 5; top_z_offset = (core_h / 2) - (core_center_h / 2); arms_outer_d = 48; arms_inner_d = 48 - 7; core_void_outer_d = 20.5; core_void_inner_d = 14.5; core_void_h = 11.5; film_void = 0.8; translate([0, 0, -(core_bottom_outer_h / 2) - (core_center_h / 2) ]) difference () { cylinder(r = core_bottom_outer_d / 2, h = core_bottom_outer_h + core_center_h, center = true); cylinder(r = core_bottom_outer_void_d / 2, h = core_bottom_outer_h + core_center_h + 1, center = true); } difference () { union() { //center translate([0, 0, -core_center_h / 2]) { difference () { cylinder(r = (core_bottom_outer_d - 1) / 2, h = core_center_h, center = true); rotate([0, 0, -120]) translate([20, 0, 0]) rotate([0, 0, 45]) cube([20, 20, 20], center = true); } translate([0, 0, -1]) cylinder(r = core_d / 2, h = core_center_h, center = true); } //top translate([0, 0, top_z_offset]) { cylinder(r = core_d / 2, h = core_h + core_center_h, center = true); } //bottom translate([0, 0, -(core_bottom_h / 2) - (core_center_h / 2)]) { cylinder(r = core_bottom_d / 2, h = core_bottom_h + core_center_h, center = true); } } //thread if (thread) { translate([0, 0, -LEN / 2]) metric_thread (diameter=OD + .2, pitch=PITCH, thread_size = THREAD, length=LEN); } else { cylinder(r = (OD + 0.2) / 2, h = LEN, center = true); } translate([0, 0, -2.3]) difference () { cylinder(r = core_void_outer_d / 2, h = core_void_h, center = true); cylinder(r = core_void_inner_d / 2, h = core_void_h + 1, center = true); } } //arms difference () { union () { translate([0, 0, top_z_offset]) difference() { //adjust one arm inward intersection () { cylinder(r = arms_outer_d / 2, h = core_h + core_center_h, center = true); translate([1, 0, 0]) cylinder(r = arms_outer_d / 2, h = core_h + core_center_h, center = true); } intersection () { cylinder(r = arms_inner_d / 2, h = core_h + core_center_h + 1, center = true); translate([1, 0, 0]) cylinder(r = arms_inner_d / 2, h = core_h + core_center_h + 1, center = true); } translate([0, arms_outer_d / 2, 0]) cube([arms_outer_d, arms_outer_d, arms_outer_d], center = true); } translate([(arms_outer_d + arms_inner_d) / 4, 0, top_z_offset]) cylinder(r = 3.5 / 2, h = core_h + core_center_h, center = true, $fn = 40); //adjusted arm translate([-((arms_outer_d + arms_inner_d) / 4) + 1, 0, top_z_offset]) cylinder(r = 3.5 / 2, h = core_h + core_center_h, center = true, $fn = 40); difference () { rotate([0, 0, -120]) translate([13.75, 0, top_z_offset]) cube([16, 20, core_h + core_center_h], center = true); //remove piece from adjusting arm translate([-19, -14, 0]) rotate([0, 0, 10]) cube([4, 4, 30], center = true); rotate([0, 0, -120 - 37]) translate([18, 0, top_z_offset]) { cylinder(r = 6.8 / 2, h = 30, center = true); translate([-4, -2, 0]) cube([4, 4, 30], center = true); } rotate([0, 0, -120 + 37]) translate([18, 0, top_z_offset]) { cylinder(r = 6.8 / 2, h = 30, center = true); translate([-4, 2, 0]) cube([4, 4, 30], center = true); } } } rotate([0, 0, -120]) translate([20, -5, 0]) rotate([0, 0, 45]) cube([20, film_void, 30], center = true); rotate([0, 0, -120]) translate([20, 5, 0]) rotate([0, 0, -45]) cube([20, film_void, 30], center = true); rotate([0, 0, -120]) translate([25, 0, 0]) difference () { cylinder(r = 8 / 2, h = 30, center = true); translate([-6.9, 0, 0]) cube([8, 8, 30], center = true); } cylinder(r = core_void_outer_d / 2, h = core_void_h, center = true); rotate([0, 0, -120]) translate([20, 0, -1.5]) rotate([0, 0, 45]) cube([20, 20, 3.01], center = true); } } module spiral_bottom (threads = false, spiral_count = 40) { outer_d = 215; outer_d_inside = 209; outer_h = 7.5; spoke_len = 81; spoke_w = 3; spoke_h = 4.2 + 3; spoke_2_len = 43; spoke_2_h = 6; translate([0, 0, -3.75]) difference () { cylinder(r = outer_d / 2, h = outer_h, center = true, $fn = 500); cylinder(r = outer_d_inside / 2, h = outer_h + 1, center = true, $fn = 500); } //rounding voids difference () { spiral_bottom_core(threads); for (i = [0 : SPOKE_COUNT]) { rotate([0, 0, (i + 0.5) * (360 / SPOKE_COUNT)]) translate([0, 26.75, 0]) cylinder(r = 2, h = 20, center = true, $fn = 40); } } for (i = [0 : SPOKE_COUNT]) { rotate([0, 0, i * (360 / SPOKE_COUNT)]) translate([(spoke_len / 2) + (48 / 2), 0, -3.6]) cube([spoke_len, spoke_w, spoke_h], center = true); } for (i = [0 : SPOKE_COUNT]) { rotate([0, 0, (i + 0.5) * (360 / SPOKE_COUNT)]) translate([(outer_d / 2) - (spoke_2_len / 2) - 2, 0, -3]) cube([spoke_2_len, spoke_w, spoke_2_h], center = true); } for (i = [0 : SPOKE_COUNT]) { rotate([0, 0, (i + 0.5) * (360 / SPOKE_COUNT)]) translate([63, 0, -3]) rotate([0, 0, 20]) cube([ spoke_w, 18, spoke_2_h], center = true); } //translate([0, 0, 1]) rotate([0, 0, 0]) spiral_2 (START_D = 46.95, SPIRALS = spirals); //12 //40 translate([0, 0, -.1]) spirals(spiral_count, 46.95 - 1.2, 2.075); } module spiral_top_core () { $fn = 360; core_center_h = 3; core_bottom_outer_d = 53; core_bottom_outer_void_d = 44; core_bottom_outer_h = 4.2; core_d = 29.5; core_h = 8.5; core_bottom_d = 26; core_bottom_h = 4.2; top_z_offset = (core_h / 2) - (core_center_h / 2); core_void_outer_d = 20.5; core_void_inner_d = 14.5; core_void_h = 11.5; arms_outer_d = 48; arms_inner_d = 48 - 7; void_d = 18; film_void = 0.8; translate([0, 0, -(core_bottom_outer_h / 2) - (core_center_h / 2) ]) difference () { cylinder(r = core_bottom_outer_d / 2, h = core_bottom_outer_h + core_center_h, center = true); cylinder(r = core_bottom_outer_void_d / 2, h = core_bottom_outer_h + core_center_h + 1, center = true); } difference () { union() { //center translate([0, 0, -core_center_h / 2]) { difference () { cylinder(r = (core_bottom_outer_d - 1) / 2, h = core_center_h, center = true); rotate([0, 0, -120]) translate([20, 0, 0]) rotate([0, 0, 45]) cube([20, 20, 20], center = true); } translate([0, 0, -1]) cylinder(r = core_d / 2, h = core_center_h, center = true); } //top translate([0, 0, top_z_offset]) { cylinder(r = core_d / 2, h = core_h + core_center_h, center = true); } //bottom translate([0, 0, -(core_bottom_h / 2) - (core_center_h / 2)]) { cylinder(r = core_bottom_d / 2, h = core_bottom_h + core_center_h, center = true); } } cylinder(r = void_d / 2, h = 30, center = true); translate([0, 0, -12]) spacer_ridges(); } //arms difference () { union () { translate([0, 0, top_z_offset]) difference() { //adjust the shorter arm intersection () { cylinder(r = arms_outer_d / 2, h = core_h + core_center_h, center = true); translate([1, 0, 0]) cylinder(r = arms_outer_d / 2, h = core_h + core_center_h, center = true); } intersection () { cylinder(r = arms_inner_d / 2, h = core_h + core_center_h + 1, center = true); translate([1, 0, 0]) cylinder(r = arms_inner_d / 2, h = core_h + core_center_h + 1, center = true); } translate([0, arms_outer_d / 2, 0]) cube([arms_outer_d, arms_outer_d, arms_outer_d], center = true); } translate([(arms_outer_d + arms_inner_d) / 4, 0, top_z_offset]) cylinder(r = 3.5 / 2, h = core_h + core_center_h, center = true, $fn = 40); //adjusted arm translate([-((arms_outer_d + arms_inner_d) / 4) + 1, 0, top_z_offset]) cylinder(r = 3.5 / 2, h = core_h + core_center_h, center = true, $fn = 40); difference () { rotate([0, 0, -120]) translate([13.75, 0, top_z_offset]) cube([16, 20, core_h + core_center_h], center = true); //remove piece from adjusting arm translate([-19, -14, 0]) rotate([0, 0, 10]) cube([4, 4, 30], center = true); rotate([0, 0, -120 - 37]) translate([18, 0, top_z_offset]) { cylinder(r = 6.8 / 2, h = 30, center = true); translate([-4, -2, 0]) cube([4, 4, 30], center = true); } rotate([0, 0, -120 + 37]) translate([18, 0, top_z_offset]) { cylinder(r = 6.8 / 2, h = 30, center = true); translate([-4, 2, 0]) cube([4, 4, 30], center = true); } } } rotate([0, 0, -120]) translate([20, -5, 0]) rotate([0, 0, 45]) cube([20, film_void, 30], center = true); rotate([0, 0, -120]) translate([20, 5, 0]) rotate([0, 0, -45]) cube([20, film_void, 30], center = true); rotate([0, 0, -120]) translate([25, 0, 0]) difference () { cylinder(r = 8 / 2, h = 30, center = true); translate([-6.9, 0, 0]) cube([8, 8, 30], center = true); } cylinder(r = core_void_outer_d / 2, h = core_void_h, center = true); rotate([0, 0, -120]) translate([20, 0, -1.5]) rotate([0, 0, 45]) cube([20, 20, 3.01], center = true); cylinder(r = void_d / 2, h = 30, center = true); } } module spiral_top (spiral_count = 40) { outer_d = 215; outer_d_inside = 209; outer_h = 7.5; spoke_len = 81; spoke_w = 3; spoke_h = 4.2 + 3; spoke_2_len = 43; spoke_2_h = 6; translate([0, 0, -3.75]) difference () { cylinder(r = outer_d / 2, h = outer_h, center = true, $fn = 500); cylinder(r = outer_d_inside / 2, h = outer_h + 1, center = true, $fn = 500); } difference () { spiral_top_core(); for (i = [0 : SPOKE_COUNT]) { rotate([0, 0, (i + 0.5) * (360 / SPOKE_COUNT)]) translate([0, 26.75, 0]) cylinder(r = 2, h = 20, center = true, $fn = 40); } } for (i = [0 : SPOKE_COUNT]) { rotate([0, 0, i * (360 / SPOKE_COUNT)]) translate([(spoke_len / 2) + (48 / 2), 0, -3.6]) cube([spoke_len, spoke_w, spoke_h], center = true); } for (i = [0 : SPOKE_COUNT]) { rotate([0, 0, (i + 0.5) * (360 / SPOKE_COUNT)]) translate([(outer_d / 2) - (spoke_2_len / 2) - 2, 0, -3]) cube([spoke_2_len, spoke_w, spoke_2_h], center = true); } for (i = [0 : SPOKE_COUNT]) { rotate([0, 0, (i + 0.5) * (360 / SPOKE_COUNT)]) translate([63, 0, -3]) rotate([0, 0, 20]) cube([ spoke_w, 18, spoke_2_h], center = true); } //translate([0, 0, 1]) rotate([0, 0, 0]) spiral_2 (START_D = 46.95, SPIRALS = spiral_count);//12 //40 translate([0, 0, -.1]) spirals(spiral_count, 46.95 - 1.2, 2.075); } module spacer_ridges () { ridges = 16; for (i = [0 : ridges]) { rotate([0, 0, i * (360 / ridges)]) translate([13.5, 0, 0]) cylinder(r = 1.25, h = 8, $fn = 60); } } module spacer_ridges_loose () { ridges = 16; intersection () { union () { for (i = [0 : ridges]) { rotate([0, 0, i * (360 / ridges)]) translate([13.7, 0, 0]) cylinder(r = 1.25, h = 8, $fn = 60); } } cylinder(r = 13.7, h = 12, center = true); } } module spacer_outer_ridges () { ridges = 24; H = 6.5; difference () { union () { for (i = [0 : ridges]) { rotate([0, 0, i * (360 / ridges)]) translate([14.6, 0, -4.75]) cylinder(r = 1.25, h = 8, $fn = 30); } } translate([0, 0, -4.1]) difference () { cylinder(r = 33 / 2, h = 4, center = true, $fn = 100); cylinder(r2 = 33 / 2, r1 = 27.75 / 2, h = 4.1, center = true, $fn = 100); } } } module spacer () { add = 3.25; core_d = 29.5; core_bottom_d = 26.2 + .2; void_d = 22.5; h = 8 + add; translate([0, 0, (add / 2) - 1]) difference () { union () { difference () { cylinder(r = core_d / 2, h = h, center = true, $fn = 200); translate([0, 0, 8]) cylinder(r = core_bottom_d / 2, h = h, center = true, $fn = 200); cylinder(r = void_d / 2, h = h + 1, center = true, $fn = 200); } translate([0, 0, 0]) spacer_ridges_loose(); spacer_outer_ridges(); } //trim top translate([0, 0, h - 0.1]) cylinder(r = (core_d + 1) / 2, h = h, center = true, $fn = 200); //trim bottom translate([0, 0, -h + 0.9]) cylinder(r = (core_d + 1) / 2, h = h, center = true, $fn = 200); //finger grips //translate([0, 24, 0]) rotate([-6, 0, 0]) cylinder(r = 10, h = 6, center = true, $fn = 100); //translate([0, -24, 0]) rotate([6, 0, 0]) cylinder(r = 10, h = 6, center = true, $fn = 100); } } module top () { H = 5; center_d = 53; spoke_w = 4.5; spokes = 12; outer_d = 215; inner_d = 150; void_d = 22.5; hole_d = 3.5; hole_spacing = 37; core_d = 29.5; core_bottom_d = 26.2; difference () { union () { cylinder(r = center_d / 2, h = H, center = true, $fn = 100); for (i = [0 : spokes]) { rotate([0, 0, i * (360 / spokes)]) translate([0, outer_d / 4, 0]) cube([spoke_w, (outer_d / 2) - 1, H], center = true); } } //void cylinder(r = void_d / 2, h = H + 1, center = true, $fn = 100); //speed holes for (i = [0 : 3]) { rotate([0, 0, (i * 90) + 45]) translate([0, hole_spacing / 2, 0]) cylinder(r = hole_d / 2, h = H + 1, center = true); } //rounding of center cylinder for (i = [0 : spokes]) { rotate([0, 0, (i + 0.5) * (360 / spokes)]) translate([-2.75, 26.5, 0]) cylinder(r = 2, h = H+1, center = true, $fn = 40); rotate([0, 0, (i + 0.5) * (360 / spokes)]) translate([2.75, 26.5, 0]) cylinder(r = 2, h = H+1, center = true, $fn = 40); rotate([0, 0, (i + 0.5) * (360 / spokes)]) translate([0, 26.5, 0]) cube([5, 4, H + 1], center = true); } } difference () { cylinder(r = (center_d / 2) - 1.8, h = H, center = true, $fn = 200); cylinder(r = (hole_spacing / 2) + 2, h = H + 1, center = true, $fn = 200); } //outer ring difference () { cylinder(r = outer_d / 2, h = H, center = true, $fn = 200); cylinder(r = (outer_d / 2) - 5, h = H + 1, center = true, $fn = 200); } //inner ring difference () { cylinder(r = inner_d / 2, h = H, center = true, $fn = 200); cylinder(r = (inner_d / 2) - 5, h = H + 1, center = true, $fn = 200); } //rounded cross connectors for (i = [0 : spokes]) { rotate([0, 0, i * (360 / spokes)]) translate([0, (inner_d / 2) - (spoke_w / 2), 0]) difference() { cylinder(r = 6.5, h = H, center = true); translate([6.25, 6, 0]) cylinder(r = 4, h = H + 1, center = true, $fn = 60); translate([-6.25, 6, 0]) cylinder(r = 4, h = H + 1, center = true, $fn = 60); translate([-6.1, -7, 0]) cylinder(r = 4, h = H + 1, center = true, $fn = 60); translate([6.1, -7, 0]) cylinder(r = 4, h = H + 1, center = true, $fn = 60); } } difference () { union () { translate([0, 0, 3.75 + 1]) cylinder(r = core_d / 2, h = H, center = true, $fn = 60); translate([0, 0, 3.75 + 1 + 3.2]) cylinder(r = core_bottom_d / 2, h = H, center = true, $fn = 60); } cylinder(r = void_d / 2, h = H * 5 , center = true, $fn = 100); translate([0, 0, 4 + 1 + 2.25]) spacer_ridges(); } //rounded outer ring connectors for (i = [0 : spokes]) { rotate([0, 0, i * (360 / spokes)]) translate([0, 205 / 2, 0]) difference () { cube([13, 9, H], center = true); translate([6.2, -4.2, 0]) cylinder(r = 4, h = H + 1, center = true, $fn = 60); translate([-6.2, -4.2, 0]) cylinder(r = 4, h = H + 1, center = true, $fn = 60); } } } module spiral_facet_2 (i, SPIRAL, START_R = 48, SPACING = 2, FACET_SIZE = 1, FN = 360) { BOTTOM_T = 1.2; TOP_T = .3; H = 2.1; STEP_SIZE = SPACING / FN; STEP_OFFSET = (SPIRAL * SPACING) + (i * STEP_SIZE); ROT = i* (360 / FN); ANGLE = 0; OFFSET = START_R + STEP_OFFSET; rotate([0, 0, ROT]) translate ([OFFSET, 0, - H / 2]) { rotate ([0, 0, ANGLE]) { hull () { translate([0, 0, H]) cube([TOP_T, FACET_SIZE, 0.1], center=true); cube([BOTTOM_T, FACET_SIZE, 0.1], center=true); } } } } module spiral_2 (SPIRALS = 40, START_D = 48) { SPACING = 2.075; FACET_SIZE = 2; for (SPIRAL = [0 : SPIRALS - 1]) { //C = PI * R^2 C = PI * pow(( (START_D / 2) + (SPIRAL * SPACING) ) / 2, 2); FN = ceil( C / FACET_SIZE ); for (i = [0 : FN - 1]) { spiral_facet_2(i, SPIRAL, START_D / 2, SPACING, FACET_SIZE, FN); } } } module spirals (count = 40, start_d = 48, spacing = 2) { facet_size = 30; bottom = 1.2; top = .3; top_offset = (bottom - top); h = 2.2; od = start_d + (spacing * 2 * count); echo("SPIRAL LENGTH", PI * count * (od + start_d + 1) / 2); echo("OUTER D", od); facetProfile = [[0, 0], [top_offset, -h], [bottom, -h], [bottom, 0]]; union () { for (s = [0 : count - 1]) { d = start_d + (s * spacing * 2); c = PI * pow(d / 2, 2); $fn = ceil( c / facet_size ); angle_i = 360 / $fn; increment = spacing / $fn; spiralPath = [ for(t = [0 : $fn + 1]) [((d / 2) + (t * increment)) * cos(t * angle_i), ((d / 2) + (t * increment)) * sin(t * angle_i), 0] ]; path_extrude(exShape=facetProfile, exPath=spiralPath); } } } module spirals_compressed (count = 40, start_d = 48, spacing = 2 ) { facet_size = 30; bottom = 1.2; top = .3; top_offset = (bottom - top); h = 2.2; facetProfile = [[0, 0], [top_offset, -h], [bottom, -h], [bottom, 0]]; spiralPath = [ for (s = [0 : count - 1]) for(t = [0 : ceil( (PI * pow((start_d + (s * spacing * 2)) / 2, 2)) / facet_size ) - 1]) [(((start_d + (s * spacing * 2)) / 2) + (t * (spacing / ceil( (PI * pow((start_d + (s * spacing * 2)) / 2, 2)) / facet_size )))) * cos(t * (360 / ceil( (PI * pow((start_d + (s * spacing * 2)) / 2, 2)) / facet_size ))), (((start_d + (s * spacing * 2)) / 2) + (t * (spacing / ceil( (PI * pow((start_d + (s * spacing * 2)) / 2, 2)) / facet_size )))) * sin(t * (360 / ceil( (PI * pow((start_d + (s * spacing * 2)) / 2, 2)) / facet_size ))), 0] ]; path_extrude(exShape=facetProfile, exPath=spiralPath); }