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- $fn = 42;
-
- module prism(l, w, h) {
- polyhedron(
- points = [[0,0,0], [l,0,0], [l,w,0], [0,w,0], [0,w,h], [l,w,h]],
- faces = [[0,1,2,3],[5,4,3,2],[0,4,5,1],[0,3,4],[5,2,1]]
- );
- }
-
- difference() {
- union() {
- color("green")
- hull() {
- cube([80, 40, 5]);
- cube([40, 80, 5]);
- }
-
- color("red")
- for (i = [0, 20])
- translate([45, 7.5 + i, 5])
- cube([35, 5, 1]);
-
- color("red")
- for (i = [0, 20])
- translate([7.5 + i, 45, 5])
- cube([5, 35, 1]);
- }
-
- translate([40, 40 + 23, -1])
- rotate([0, -90, 180])
- prism(7, 23, 23);
-
- for (i = [30, 70])
- translate([i, 10, -1])
- cylinder(d = 5.2, h = 8);
-
- for (i = [10, 70])
- translate([i, 30, -1])
- cylinder(d = 5.2, h = 8);
-
- for (i = [10, 30])
- translate([i, 70, -1])
- cylinder(d = 5.2, h = 8);
- }
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