include<BOSL2/std.scad>

kula_d = 50;
pret_t = 2.5;
pret_l = 27;

$fn = 13;

corner = pret_l/2 - pret_t/2;

difference() {
    spheroid(d=kula_d, style="octa");
    // cuboid([kula_d,kula_d,kula_d], rounding=10);
    down(kula_d/4) union() {
        left(corner) cuboid([pret_t,pret_l,kula_d]);
        fwd(corner) cuboid([pret_l,pret_t,kula_d]);
        left(corner) fwd(corner) pie_slice(h=kula_d/2, d=10, ang=90);
    }
    down(kula_d*3/4) cuboid([kula_d, kula_d, kula_d]);
}