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radius = 12.25;
len = 40;
wall = 4;
screw_radius = 1.5;
screw_head_radius = 2.5;
screw_head_h = 2;
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() {
translate([wall, 0, 0])
cube([len-wall*2, (radius+wall)*2, radius+wall]);
hull() {
translate([screw_radius+wall, -screw_radius-wall, 0])
cylinder(r=screw_radius+wall, h=wall);
translate([len-screw_radius-wall, radius*2+wall*3+screw_radius, 0])
cylinder(r=screw_radius+wall, h=wall);
}
hull() {
translate([screw_radius+wall, radius*2+wall*3+screw_radius, 0])
cylinder(r=screw_radius+wall, h=wall);
translate([len-screw_radius-wall, -screw_radius-wall, 0])
cylinder(r=screw_radius+wall, h=wall);
}
translate([screw_radius+wall, -screw_radius-wall, 0])
cube([len-(screw_radius+wall)*2, screw_radius+wall, wall]);
translate([screw_radius+wall, (radius+wall)*2, 0])
cube([len-(screw_radius+wall)*2, screw_radius+wall, wall]);
}
translate([-1, radius+wall, radius+wall]) rotate([0, 90, 0]) cylinder(r=radius, h=len+2);
translate([screw_radius+wall, -screw_radius-wall, 0])
screw_hole();
translate([len-screw_radius-wall, radius*2+wall*3+screw_radius, 0])
screw_hole();
translate([screw_radius+wall, radius*2+wall*3+screw_radius, 0])
screw_hole();
translate([len-screw_radius-wall, -screw_radius-wall, 0])
screw_hole();
}
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