Parametric CAD for coders, a wrapper for cadquery objects.
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What is cqparts?

cqparts is CAD for Python programmers, short for "cadquery parts".

Using cqparts you can wrap geometry made with cadquery to build complex and deeply parametric models.

Full documentation at:



You'll need to fulfill the requirements of cadquery, the simplest way to do that is to install cadquery first by following the instructions here:


Once cadquery is installed, install cqparts with:

pip install cqparts

cqparts_* Content Libraries

You can also install content libraries with a similar pip install command.

List available libraries with:

pip search cqparts-

For example, to install the cqparts_bearings content library, run:

pip install cqparts-bearings

_Note_: pip packages use - to separate words, but when importing them the standard _ is used.

Example Usage

Here is just one of the simplest examples to give you an idea of what this library does.

More detailed examples found in the official documentation for cqparts.

Wrapping a Cube

A simple cube defined with cadquery alone:

# create unit cube solid
import cadquery
size = 10
cube = cadquery.Workplane('XY').box(size, size, size)

# display cube (optional)
from Helpers import show

Wrapping this in a cqparts.Part object can be done like this:

# create unit cube as cqparts.Part
import cadquery
import cqparts
from cqparts.params import PositiveFloat

class MyCube(cqparts.Part):
    size = PositiveFloat(1, doc="cube size")
    def make(self):
        return cadquery.Workplane('XY').box(self.size, self.size, self.size)

# create cube instance
cube = MyCube(size=10)

# display cube (optional)
from cqparts.display import display

You can see that under the bonnet (in the make function) the geometry is created with cadquery, but the resulting MyCube class is instantiated more intuitively, and more object orientated.

Creating a Hierarchy

cqparts can also be used to create a deep hierarchy of parts and assemblies to build something deeply complicated and entirely parametric.

A simple example of this is the toy car tutorial.

cqparts Capabilities

The work done in cqparts_fasteners is a good example of how useful cqparts wrapping can be; read about the Fastener class, how it works, and what can be done with it in the cqparts_fasteners docs


Issues, and Pull Requests are encouraged, and happily received, please read for guidance on how to contribute.