| 1 | /* GNU AGPLv3 (or later at your option) |
| 2 | see bottom for more license info */ |
| 3 | |
| 4 | /* measurements from misumi's 3030 aluminum extrusion data sheet |
| 5 | https://us.misumi-ec.com/pdf/fa/2012/p2_0545.pdf |
| 6 | */ |
| 7 | |
| 8 | x = 30; |
| 9 | y = 30; |
| 10 | diagonal = sqrt(pow(30/2, 2) + pow(30/2, 2)); |
| 11 | opening_width = 8; |
| 12 | inner_block = 12; |
| 13 | |
| 14 | corner_block_inner = (30 - 16.5) / 2; |
| 15 | wall = 2; |
| 16 | |
| 17 | $fn = 40; |
| 18 | |
| 19 | module arm_half(){ |
| 20 | square(inner_block / 2); |
| 21 | rotate(45) { |
| 22 | square([diagonal - wall, wall / 2]); } |
| 23 | translate([x / 2 - corner_block_inner, y / 2 - corner_block_inner]) { |
| 24 | square(corner_block_inner - wall); } |
| 25 | translate([opening_width / 2 + wall, y / 2 - wall]) { |
| 26 | square([(x - opening_width) / 2 - 2 * wall, wall]); |
| 27 | translate([0, wall / 2]){ |
| 28 | circle(d = wall); } } |
| 29 | translate([x / 2 - wall, y / 2 - wall]) { |
| 30 | circle(wall); } } |
| 31 | |
| 32 | arms = 4; |
| 33 | for(arm = [0:arms - 1]) { |
| 34 | rotate(arm * 360 / arms) { |
| 35 | arm_half(); |
| 36 | mirror(){ arm_half(); } } } |
| 37 | |
| 38 | /* |
| 39 | This file is part of 3d-printables. |
| 40 | |
| 41 | 3d-printables is free software: you can redistribute it and/or modify |
| 42 | it under the terms of the GNU Affero General Public License as published by |
| 43 | the Free Software Foundation, either version 3 of the License, or |
| 44 | (at your option) any later version. |
| 45 | |
| 46 | 3d-printables is distributed in the hope that it will be useful, |
| 47 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 48 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 49 | GNU Affero General Public License for more details. |
| 50 | |
| 51 | You should have received a copy of the GNU Affero General Public License |
| 52 | along with challenge-bot. If not, see <http://www.gnu.org/licenses/>. |
| 53 | */ |