add nut shape for wire jig

diff --git a/3d-printables/nut.scad b/3d-printables/nut.scad
new file mode 100644 (file)
index 0000000..16d0b8e
--- /dev/null
+++ b/3d-printables/nut.scad
@@ -0,0 +1,31 @@
+/*
+Copyright (C) 2014 Daniel Watson
+See the end of the file for license conditions.
+*/
+
+module nut_2d(size) {
+  side_length = size * sin(30) / sin(120);
+  for(ii = [-1:1]) {
+    rotate(a = 120 * ii, v = [0, 0, 1]) {
+      square([side_length, size], center = true); } } }
+
+module nut(size, height) {
+  linear_extrude(height = height) {
+    nut_2d(size); } }
+
+/*
+This file is part of challenge-bot.
+
+Printables is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+GNU Affero Emacs 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 Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with Printables.  If not, see <http://www.gnu.org/licenses/>.
+*/