turners_cube.js

const { cylinder, cube, difference, union } = require('@dotcore64/scad-js');
const cylinder1 = x => cylinder(12, x / 2);

const cy3 = x => union(
    cylinder1(x).rotate([90, 0, 0]),
    cylinder1(x).rotate([0, 90, 0]),
    cylinder1(x).rotate([0, 0, 90]),
);

const cutCube = x => difference(cube(x), cy3(x - 0.5));

const output = union(...[4, 6, 8, 10].map(x => cutCube(x)));

console.log(output.serialize({$fn: 20}));