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radius = 12.25;
len = 40;
wall = 4;
screw_radius = 1.5;
screw_head_radius = 2.5;
screw_head_h = 2;
screw_hole_pos = [
[screw_radius+wall, -screw_radius-wall, 0],
[radius*2+wall-screw_radius, -screw_radius-wall, 0],
[radius*2+wall-screw_radius, len+screw_radius+wall, 0],
[screw_radius+wall, len+screw_radius+wall, 0],
];
module screw_hole() {
union() {
translate([0, 0, -1])cylinder(r=screw_radius, h=wall+2);
translate([0, 0, wall-screw_head_h])
cylinder(r1=screw_radius, r2=screw_head_radius, h=screw_head_h+0.1);
}
}
difference() {
union() {
cube([(radius+wall)*2, len, radius+wall]);
hull() {
translate(screw_hole_pos[0]) cylinder(r=screw_radius+wall, h=wall);
translate(screw_hole_pos[2]) cylinder(r=screw_radius+wall, h=wall);
}
hull() {
translate(screw_hole_pos[1]) cylinder(r=screw_radius+wall, h=wall);
translate(screw_hole_pos[3]) cylinder(r=screw_radius+wall, h=wall);
}
translate([screw_radius+wall, -screw_radius-wall, 0])
cube([(radius-screw_radius)*2, screw_radius+wall, wall]);
translate([screw_radius+wall, len, 0])
cube([(radius-screw_radius)*2, screw_radius+wall, wall]);
}
translate([radius+wall, -1, radius+wall])
rotate([-90, 0, 0]) cylinder(r=radius, h=len+2);
for (i = [0:3]) {
translate(screw_hole_pos[i]) screw_hole();
}
}
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