PrimSharp

https://github.com/merklegroot/PrimSharp

A C# library for Constructive Solid Geometry

Objects are rendered to OpenSCAD code.
You can paste the rendered code into OpenSCAD and use it to generate an STL file.

OpenSCAD

You can get OpenSCAD from here:
https://openscad.org/

Notes

Dimensions use Width, Breadth, and Height. I went with "Breadth" instead of "Length" to avoid conflicts with the word "Length."

Example

Running this:

new Cube()
    .RotateZ(45)
    .ToOpenScad();

Gives you this:

rotate([0, 0, 45])
cube([1, 1, 1], center=true);

Note that the geometry isn't translated to OpenScad until the ToOpenScad() method is called.

Getting outputs

I usually just use unit tests to retrieve outputs for a model.
This probably isn't the best use of tests, but it works.

using PrimSharp;
using Xunit;
using Xunit.Abstractions;

namespace PrimSharpTests
{
    public class BoxTests
    {
        private readonly ITestOutputHelper _outputHelper;
        public BoxTests(ITestOutputHelper outputHelper) => _outputHelper = outputHelper;

        [Fact]
        public void Box_with_defaults() =>
            _outputHelper.WriteLine(new Box().ToOpenScad());   
    }
}

Primitives

Cube - a rectangular solid

new Cube(width: 3, breadth: 5, height: 2);

Cylinder - you know what a cylinder is.

new Cylinder(radius: 2, height: 5);

Simple Operations

new Box(4, 4, 1).Subtract(new Box(2, 2, 1));

Projects

PrimSharp - Primitives
PrimDesign - Models created from primitives