If you've ever wondered if there is a better alternative to doing mechanical CAD with proprietary software products, CadQuery and this package - cq_warehouse - and similar packages like cq_gears might be what you've been looking for. CadQuery augments the Python programming language (the second most widely used programming language) with powerful capabilities enabling a wide variety of mechanical designs to be created in S/W with the same techniques that enable most of today's technology.
cq_warehouse augments CadQuery with parametric parts - generated on demand - and extensions to the core CadQuery capabilities. The resulting parts can be used within your projects or saved to a CAD file in STEP or STL format (among others) for use in a wide variety of CAD, CAM, or analytical systems.
The documentation for cq_warehouse can found at readthedocs.
To install cq_warehouse from github:
python3 -m pip install git+https://github.com/gumyr/cq_warehouse.git#egg=cq_warehouse
To install the working dev branch:
python3 -m pip install git+https://github.com/gumyr/cq_warehouse.git@dev#egg=cq_warehouse