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t = 50;
w = 20;
wi = 15;
h = 5;
d = 1;
aw = 4;
at = 5;
ad = 2;
cr = 2;
support_fraction = 0.5;
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]]);
}
difference() {
union() {
// base plate
cube([w, t, d]);
// back
cube([w, d, h]);
// sides and top
side();
translate([w, 0, 0]) mirror() side();
}
union() {
// retainer hole
translate([(w-aw)/2, t-at-ad, 0]) cube([aw, at, 2*d]);
// round vertical corners
translate([0, 0, 0]) rotate(a=180) round_corner(r=cr, h=h);
translate([w, 0, 0]) rotate(a=270) round_corner(r=cr, h=h);
translate([w, t, 0]) rotate(a=0 ) round_corner(r=cr, h=h);
translate([0, t, 0]) rotate(a=90 ) round_corner(r=cr, h=h);
}
}
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