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// dimension of the outer box: *w*idth, dep*t*h, *h*eight, thickness (d), width of the upper slot (wi)
d = 2.4;
t = 41 + d;
w = 18 + 2*d;
wi = 13.1;
h = 5.1 + d;
// dimension of the retainer hole: *w*idth, dep*t*h, *d*istance to edge
aw = 8.6;
at = 4.1;
ad = t - d - 34.6 - at;
// curve radius of rounded corners
cr = 2;
// inclination of ceiling support structure
support_fraction = 0.2;
module round_corner(r, h) {
translate([-r, -r, 0])
difference() {
cube([r, r, h]);
cylinder(h=h, r=r, $fn=50);
}
}
module side() {
w2 = (w-wi)/2;
s = support_fraction * (w2 - d);
translate([0, t, 0])
rotate([90, 0, 0])
linear_extrude(height = t, convexity=2)
polygon([[0,0], [0,h], [w2,h], [w2,h-d+s], [d,h-d], [d,0]]);
}
module half() {
translate([-w/2, 0, 0])
difference() {
union() {
// base plate
cube([w/2, t, d]);
// back
cube([w/2, d, h]);
// sides and top
side();
}
union() {
// retainer hole
translate([(w-aw)/2, t-at-ad, 0]) cube([aw/2, at, 2*d]);
// round vertical corners
translate([0, 0, 0]) rotate(a=180) round_corner(r=cr, h=h);
translate([0, t, 0]) rotate(a=90 ) round_corner(r=cr, h=h);
// shorten rail at opening
translate([d, t-d, h-d]) cube(d);
}
}
}
half();
mirror() half();
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