ea7617aa |
1 | /* |
2 | GNU AGPLv3 (or later at your option) |
14f68eaf |
3 | see bottom for more license info. |
ea7617aa |
4 | please keep this notice. |
5 | */ |
14f68eaf |
6 | |
ea7617aa |
7 | /* |
8 | measurements from misumi's 3030 aluminum extrusion data sheet |
9 | https://us.misumi-ec.com/pdf/fa/2012/p2_0545.pdf |
10 | */ |
14f68eaf |
11 | |
12 | //$fn = 30; // use this while editing |
13 | $fn = 100; // use this for generating STL |
14 | |
15 | foot_height = 18; |
16 | foot_length = 20; |
17 | wall_width = 2; |
23bbb57b |
18 | nub_depth = 4; |
0cb1eaa0 |
19 | desired_corner_rounding_radius = 2/2.1; |
20 | |
21 | // rounding radius needs to be just under half the size of the wall_width |
22 | maximum_corner_rounding_radius = wall_width / 2 - 0.1; |
23 | corner_rounding_radius = |
24 | (desired_corner_rounding_radius < maximum_corner_rounding_radius) |
25 | ? |
26 | desired_corner_rounding_radius |
27 | : |
28 | maximum_corner_rounding_radius; |
23bbb57b |
29 | |
293dbe2d |
30 | // the printed nubs did not fit into the extrusion gap perfectly. |
31 | // we can change the model just a little bit to accomodate printing |
32 | // imperfections. |
23bbb57b |
33 | fudge = 0.1; |
34 | //fudge = 0.0; |
14f68eaf |
35 | |
36 | // 3030 dimensions |
293dbe2d |
37 | x = 30; |
38 | y = 30; |
14f68eaf |
39 | opening_width = 8; |
40 | |
41 | outer_block = (30 - 16.5) / 2; |
42 | wall = 2; |
43 | |
44 | module ring(outer_radius, wall_width) { |
45 | difference() { |
46 | circle(outer_radius); |
47 | circle(outer_radius - wall_width); } } |
48 | |
49 | module fillet(r) { |
50 | offset(-r) { |
51 | offset(r) { |
52 | children(); } } } |
53 | |
54 | module round_corners(r) { |
55 | fillet(r) { fillet(-r) { children(); } } } |
56 | |
293dbe2d |
57 | module side_nub() { |
58 | // side nub, goes into side 3030 openings |
59 | a = opening_width; |
60 | b = foot_height + wall_width - (y - opening_width) / 2; |
61 | side_nub_length = (a < b) ? a : b; |
62 | translate([0, (y - opening_width) / 2 + fudge]) { |
63 | square([nub_depth, side_nub_length - fudge]); } } |
64 | |
65 | module bottom_nub() { |
66 | // bottom nub, goes into bottom 3030 opening |
67 | translate([(x - opening_width) / 2, 0]) { |
68 | square([opening_width / 2, nub_depth]); } } |
69 | |
14f68eaf |
70 | module half_foot_2d() { |
71 | // outer ring |
72 | difference() { |
73 | ring(foot_height + wall_width, wall_width); |
74 | square(foot_height + wall_width); |
75 | rotate(-45) { |
76 | square(foot_height + wall_width); } } |
77 | // upper connector, vertical 3030 holder |
78 | translate([-wall_width, -wall_width]) { |
79 | square([wall_width, foot_height + wall_width]); } |
80 | // upper connecter, horizontal 3030 holder |
81 | translate([-wall_width, -wall_width]) { |
82 | square([wall_width + x / 2, wall_width]); } |
83 | // bottom connector |
84 | translate([cos(45) * foot_height, |
85 | -(sin(45) * foot_height + wall_width)]) { |
86 | square([x / 2 - cos(45) * foot_height, wall_width]); } |
293dbe2d |
87 | bottom_nub(); |
88 | side_nub(); } |
14f68eaf |
89 | |
90 | module foot_2d() { |
0cb1eaa0 |
91 | round_corners(corner_rounding_radius) { |
14f68eaf |
92 | translate([-x / 2, 0, 0]) { |
93 | half_foot_2d(); } |
94 | translate([x / 2, 0, 0]) { |
95 | mirror() { |
96 | half_foot_2d(); } } } } |
97 | |
98 | module foot() { |
99 | rotate(a = 0, v = [1, 0, 0]) { |
100 | linear_extrude(height = foot_length) { |
101 | foot_2d(); } } } |
102 | |
103 | // half_foot_2d(); |
104 | // foot_2d(); |
105 | foot(); |
106 | |
107 | /* |
108 | This file is part of 3d-printables. |
109 | |
110 | 3d-printables is free software: you can redistribute it and/or modify |
111 | it under the terms of the GNU Affero General Public License as published by |
112 | the Free Software Foundation, either version 3 of the License, or |
113 | (at your option) any later version. |
114 | |
115 | 3d-printables is distributed in the hope that it will be useful, |
116 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
117 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
118 | GNU Affero General Public License for more details. |
119 | |
120 | You should have received a copy of the GNU Affero General Public License |
121 | along with challenge-bot. If not, see <http://www.gnu.org/licenses/>. |
122 | */ |