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Corrected teardrop_plus() shape to be an accurate compensation for slicer

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staircasing and added a plus option to tearslot(), etc.

Added horiholes.scad to depict staircase holes.
This commit is contained in:
Chris Palmer
2020-07-18 19:28:26 +01:00
parent 574a73e527
commit d08d949887
7 changed files with 218 additions and 49 deletions
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69
utils/core/teardrops.scad
View File

@@ -20,18 +20,24 @@
//
//! For making horizontal holes that don't need support material.
//! Small holes can get away without it, but they print better with truncated teardrops.
//!
//! 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
//! do not intrude into the circle.
//
module teardrop(h, r, center = true, truncate = true, chamfer = 0) { //! For making horizontal holes that don't need support material, set ```truncate = false``` to make traditional RepRap teardrops that don't even need bridging
module teardrop_2d(r, truncate) {
hull() {
circle4n(r);
if(truncate)
translate([0, r / 2])
square([2 * r * (sqrt(2) - 1), r], center = true);
else
polygon([[0, 0], [eps, 0], [0, r * sqrt(2)]]);
}
}
module teardrop(h, r, center = true, truncate = true, chamfer = 0, 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
module teardrop_2d(r, truncate)
hull()
for(y = plus ? [-1 : 1] : 0)
translate([0, y * (layer_height / 2 - eps)]) {
circle4n(r);
if(truncate)
translate([0, r / 2])
square([2 * r * (sqrt(2) - 1), r], center = true);
else
polygon([[0, 0], [eps, 0], [0, r * sqrt(2)]]);
}
render(convexity = 5)
extrude_if(h, center)
@@ -40,23 +46,23 @@ module teardrop(h, r, center = true, truncate = true, chamfer = 0) { //! For mak
teardrop_chamfer(h, center, chamfer) {
linear_extrude(eps, center = true)
teardrop_2d(r + chamfer / 2, truncate);
translate_z(-chamfer / 2)
linear_extrude(eps, center = true)
teardrop_2d(r, truncate);
}
}
module semi_teardrop(h, r, d = undef, center = true, chamfer = 0) { //! A semi teardrop in the positive Y domain
module semi_teardrop_2d(r, d) {
module semi_teardrop(h, r, d = undef, center = true, chamfer = 0, plus = false) { //! A semi teardrop in the positive Y domain
module semi_teardrop_2d(r, d)
intersection() {
R = is_undef(d) ? r : d / 2;
teardrop(r = R, h = 0);
teardrop(r = R, h = 0, plus = plus);
sq = R + 1;
translate([-sq, 0])
square([2 * sq, sq]);
}
}
render(convexity = 5)
extrude_if(h, center)
@@ -65,22 +71,21 @@ module semi_teardrop(h, r, d = undef, center = true, chamfer = 0) { //! A semi t
teardrop_chamfer(h, center, chamfer) {
linear_extrude(eps, center = true)
semi_teardrop_2d(r + chamfer / 2, d);
translate_z(-chamfer / 2)
linear_extrude(eps, center = true)
semi_teardrop_2d(r, d);
}
}
module teardrop_plus(h, r, center = true, truncate = true, chamfer = 0) //! Slightly bigger teardrop to allow for the 3D printing staircase effect
teardrop(h, r + layer_height / 4, center, truncate, chamfer);
module teardrop_plus(h, r, center = true, truncate = true, chamfer = 0) //! Slightly elongated teardrop to allow for the 3D printing staircase effect
teardrop(h, r, center, truncate, chamfer, plus = true);
module tearslot(h, r, w, center = true, chamfer = 0) { //! A horizontal slot that doesn't need support material
module tearslot_2d(r, w) {
hull() {
translate([-w / 2, 0]) teardrop(r = r, h = 0);
translate([w / 2, 0]) teardrop(r = r, h = 0);
}
}
module tearslot(h, r, w, center = true, chamfer = 0, plus = false) { //! A horizontal slot that doesn't need support material
module tearslot_2d(r, w)
hull()
for(x = [-1, 1])
translate([x * w / 2, 0]) teardrop(r = r, h = 0, plus = plus);
extrude_if(h, center)
tearslot_2d(r, w);
@@ -88,19 +93,19 @@ module tearslot(h, r, w, center = true, chamfer = 0) { //! A horizontal slot tha
teardrop_chamfer(h, center, chamfer) {
linear_extrude(eps, center = true)
tearslot_2d(r + chamfer / 2, w);
translate_z(-chamfer / 2)
linear_extrude(eps, center = true)
tearslot_2d(r, w);
}
}
module vertical_tearslot(h, r, l, center = true, chamfer = 0) { //! A vertical slot that doesn't need support material
module vertical_tearslot_2d(r, l) {
hull() {
translate([0, l / 2]) teardrop(0, r, true);
translate([0, -l / 2]) circle4n(r);
}
}
module vertical_tearslot(h, r, l, center = true, chamfer = 0, plus = false) { //! A vertical slot that doesn't need support material
module vertical_tearslot_2d(r, l)
hull()
for(y = [-1, 1])
translate([0, y * l / 2])
teardrop(0, r, true, plus = plus);
extrude_if(h, center)
vertical_tearslot_2d(r, l);
@@ -108,6 +113,7 @@ module vertical_tearslot(h, r, l, center = true, chamfer = 0) { //! A vertical s
teardrop_chamfer(h, center, chamfer) {
linear_extrude(eps, center = true)
vertical_tearslot_2d(r + chamfer / 2, l);
translate_z(-chamfer / 2)
linear_extrude(eps, center = true)
vertical_tearslot_2d(r, l);
@@ -123,4 +129,3 @@ module teardrop_chamfer(h, center, chamfer) { //! Helper module for adding chamf
hull()
children();
}

49
utils/horiholes.scad Normal file
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@@ -0,0 +1,49 @@
//
// NopSCADlib Copyright Chris Palmer 2020
// nop.head@gmail.com
// hydraraptor.blogspot.com
//
// This file is part of NopSCADlib.
//
// NopSCADlib is free software: you can redistribute it and/or modify it under the terms of the
// GNU General Public License as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
//
// NopSCADlib is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
// without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along with NopSCADlib.
// If not, see <https://www.gnu.org/licenses/>.
//
//
//! Utilities for depicting the staircase slicing of horizontal holes made with [`teardrop_plus()`](#teardrops).
//
include <../utils/core/core.scad>
function teardrop_x(r, y) = //! Calculate the ordinate of a teardrop given y. Sweeping y from -r to + r yields the positive X half of the shape.
let(x2 = sqr(r) - sqr(y))
y > r / sqrt(2) ? y >= r ? 0
: r * sqrt(2) - y
: x2 > 0 ? sqrt(x2)
: 0;
function teardrop_plus_x(r, y, h) = //! Calculate the ordinate of a compensated teardrop given y.
y < -h ? teardrop_x(r, y + h)
: y > h ? teardrop_x(r, y - h)
: r;
module horihole(r, z, h = 0, center = true) { //! For making horizontal holes that don't need support material and are correct dimensions
bot_layer = floor((z - r) / layer_height);
top_layer = ceil((z + r) / layer_height);
render(convexity = 5)
extrude_if(h, center)
for(i = [bot_layer : top_layer]) {
Z = i * layer_height;
x = teardrop_plus_x(r, Z - z + layer_height / 2, layer_height / 2);
if(x > 0)
translate([-x, Z - z])
square([2 * x, layer_height]);
}
}