Create a taurus and a cube with cylinders cut from it

example.js

const MakerCad = require('../index.js');

const Cube = function (face) {
    let sketch = MakerCad.Sketch(face);

    let line1 = sketch.line(sketch.point(0.0, 0.0), sketch.point(5.0, 0.0));
    line1.length(10).horizontal();

    let line2 = sketch.line(sketch.point(5.0, 0.0), sketch.point(5.0, 6.0));
    line2.length(10).vertical();

    let line3 = sketch.line(sketch.point(5.0, 5.0), sketch.point(0.0, 6.0));
    line3.horizontal();

    let line4 = sketch.line(sketch.point(0.0, 5.0), sketch.point(0.0, 1.0));
    line4.vertical();

    line1.getEnd().coincident(line2.getStart());
    line2.getEnd().coincident(line3.getStart());
    line3.getEnd().coincident(line4.getStart());
    line4.getEnd().coincident(line1.getStart());

    let line1Midpoint = sketch.point(0.0, 0.0).vertical(sketch.getOrigin());
    let line2Midpoint = sketch.point(0.0, 0.0).horizontal(sketch.getOrigin());

    line1.midpoint(line1Midpoint);
    line2.midpoint(line2Midpoint);

    let squareFace = MakerCad.Face(sketch);
    return squareFace.extrude(10);
};

const Cylinder = function (face, shapes = [], operation = MakerCad.MergeType.New) {
    let sketch = MakerCad.Sketch(face);

    let holeCenter = sketch.point(0, 0);
    holeCenter
        .horizontalDistance(sketch.getOrigin(), 0)
        .verticalDistance(sketch.getOrigin(), 0);

    sketch.circle(holeCenter, 9).diameter(9);

    let cylinderFace = MakerCad.Face(sketch);
    return cylinderFace.extrude(10, operation, shapes);
};

const Taurus = function(face) {
    let sketch = MakerCad.Sketch(face);
    let center = sketch.point(25, 5)
        .horizontalDistance(sketch.getOrigin(), 25)
        .verticalDistance(sketch.getOrigin(), 5);

    sketch.circle(center, 10).diameter(10);

    let axis = sketch.line(
        sketch.point(0.0, 0.0),
        sketch.point(0.0, 0.5)
    );

    axis.construction(true)
        .length(5.0)
        .vertical();

    axis.getStart().coincident(sketch.getOrigin());

    let taurusFace = MakerCad.Face(sketch);
    return taurusFace.revolve(axis, Math.PI * 2);
};

let cubeOperation = Cube(MakerCad.Plane(MakerCad.Base.Top));

let topFace = MakerCad.stream([cubeOperation])
    .faces()
    .filter(f => f.isAlignedNormal(MakerCad.Plane(MakerCad.Base.Top)))
.collectList()[0];
let cylinderOperation1 = Cylinder(topFace, [cubeOperation.shape()], MakerCad.MergeType.Remove);

frontFace = MakerCad.stream([cylinderOperation1])
    .faces()
    .filter(f => f.isAlignedNormal(MakerCad.Plane(MakerCad.Base.Front)))
.collectList()[0];
let cylinderOperation2 = Cylinder(frontFace, [cylinderOperation1.shape()], MakerCad.MergeType.Remove);

rightFace = MakerCad.stream([cylinderOperation2])
    .faces()
    .filter(f => f.isAlignedNormal(MakerCad.Plane(MakerCad.Base.Right)))
.collectList()[0];
let cylinderOperation3 = Cylinder(rightFace, [cylinderOperation2.shape()], MakerCad.MergeType.Remove);

let taurusOperation = Taurus(MakerCad.Plane(MakerCad.Base.Front));

let exportOperations = [cylinderOperation3, taurusOperation];

let shapes = MakerCad.streamOf(exportOperations).shapes().collectList();
console.log('exporting shapes', shapes);
MakerCad.exportStl("test.stl", shapes);

The above source produces the following model (saved as "test.stl"):