141 lines
5.4 KiB
OpenSCAD
141 lines
5.4 KiB
OpenSCAD
//
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// NopSCADlib Copyright Chris Palmer 2018
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// nop.head@gmail.com
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// hydraraptor.blogspot.com
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//
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// This file is part of NopSCADlib.
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//
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// NopSCADlib is free software: you can redistribute it and/or modify it under the terms of the
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// GNU General Public License as published by the Free Software Foundation, either version 3 of
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// the License, or (at your option) any later version.
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//
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// NopSCADlib is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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// without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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// See the GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along with NopSCADlib.
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// If not, see <https://www.gnu.org/licenses/>.
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//
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//
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//! For making horizontal holes that don't need support material.
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//! Small holes can get away without it, but they print better with truncated teardrops.
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//!
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//! Using teardrop_plus() or setting the plus option on other modules will elongate the teardrop vertically by the layer height, so when sliced the staircase tips
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//! do not intrude into the circle. See <https://hydraraptor.blogspot.com/2020/07/horiholes-2.html>
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//
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module teardrop(h, r, center = true, truncate = true, chamfer = 0, chamfer_both_ends = true, plus = false) { //! For making horizontal holes that don't need support material, set `truncate = false` to make traditional RepRap teardrops that don't even need bridging
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module teardrop_2d(r, truncate) {
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er = layer_height / 2 - eps; // Extrustion edge radius
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R = plus ? r + er : r; // Corrected radius
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offset = plus ? -er : 0; // Offset inwards
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hull()
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for(side = [0 : 1])
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mirror([side, 0, 0])
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intersection() {
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hull()
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translate([offset, 0]) {
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circle4n(R);
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if(truncate)
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translate([0, R / 2])
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square([2 * R * (sqrt(2) - 1), R], center = true);
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else
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polygon([[0, 0], [eps, 0], [0, R * sqrt(2)]]);
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}
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translate([0, -2 * R])
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square([R, 4 * R]);
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}
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}
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render(convexity = 5)
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extrude_if(h, center)
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teardrop_2d(r, truncate);
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teardrop_chamfer(h, center, chamfer, chamfer_both_ends) {
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linear_extrude(eps, center = true)
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teardrop_2d(r + chamfer / 2, truncate);
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translate_z(-chamfer / 2)
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linear_extrude(eps, center = true)
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teardrop_2d(r, truncate);
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}
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}
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module semi_teardrop(h, r, d = undef, center = true, chamfer = 0, chamfer_both_ends = true, plus = false) { //! A semi teardrop in the positive Y domain
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module semi_teardrop_2d(r, d)
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intersection() {
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R = is_undef(d) ? r : d / 2;
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teardrop(r = R, h = 0, plus = plus);
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sq = R + 1;
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translate([-sq, 0])
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square([2 * sq, sq]);
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}
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render(convexity = 5)
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extrude_if(h, center)
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semi_teardrop_2d(r, d);
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teardrop_chamfer(h, center, chamfer, chamfer_both_ends) {
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linear_extrude(eps, center = true)
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semi_teardrop_2d(r + chamfer / 2, d);
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translate_z(-chamfer / 2)
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linear_extrude(eps, center = true)
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semi_teardrop_2d(r, d);
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}
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}
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module teardrop_plus(h, r, center = true, truncate = true, chamfer = 0, chamfer_both_ends = true) //! Slightly elongated teardrop to allow for the 3D printing staircase effect
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teardrop(h, r, center, truncate, chamfer, chamfer_both_ends, plus = true);
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module tearslot(h, r, w, center = true, chamfer = 0, chamfer_both_ends = true, plus = false) { //! A horizontal slot that doesn't need support material
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module tearslot_2d(r, w)
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hull()
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for(x = [-1, 1])
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translate([x * w / 2, 0]) teardrop(r = r, h = 0, plus = plus);
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extrude_if(h, center)
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tearslot_2d(r, w);
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teardrop_chamfer(h, center, chamfer, chamfer_both_ends) {
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linear_extrude(eps, center = true)
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tearslot_2d(r + chamfer / 2, w);
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translate_z(-chamfer / 2)
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linear_extrude(eps, center = true)
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tearslot_2d(r, w);
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}
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}
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module vertical_tearslot(h, r, l, center = true, chamfer = 0, chamfer_both_ends = true, plus = false) { //! A vertical slot that doesn't need support material
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module vertical_tearslot_2d(r, l)
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hull()
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for(y = [-1, 1])
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translate([0, y * l / 2])
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teardrop(0, r, true, plus = plus);
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extrude_if(h, center)
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vertical_tearslot_2d(r, l);
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teardrop_chamfer(h, center, chamfer, chamfer_both_ends) {
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linear_extrude(eps, center = true)
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vertical_tearslot_2d(r + chamfer / 2, l);
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translate_z(-chamfer / 2)
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linear_extrude(eps, center = true)
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vertical_tearslot_2d(r, l);
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}
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}
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module teardrop_chamfer(h, center, chamfer, chamfer_both_ends) { //! Helper module for adding chamfer to a teardrop
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if(h && chamfer)
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translate_z(center ? 0 : h / 2)
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for(m = chamfer_both_ends ? [0, 1] : [1])
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mirror([0, 0, m])
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translate_z((h - eps ) / 2)
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hull()
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children();
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}
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