diff --git a/expressions/build123d.nix b/expressions/build123d.nix
new file mode 100644
index 0000000..f6ff013
--- /dev/null
+++ b/expressions/build123d.nix
@@ -0,0 +1,57 @@
+{
+  buildPythonPackage,
+  fetchFromGitHub,
+  # Buildtime dependencies
+  git,
+  pytestCheckHook,
+  setuptools-scm,
+  # Runtime dependencies
+  anytree,
+  ezdxf,
+  ipython,
+  numpy,
+  ocp,
+  ocpsvg,
+  py-lib3mf,
+  scipy,
+  svgpathtools,
+  trianglesolver,
+  vtk,
+}: let
+  pname = "build123d";
+  # TODO: current version is 0.5.0 but it requires lib3mf version 2.3.1 nix
+  # currently has 2.2.0 packaged. Either need to package updated version
+  # ourself our wait for upstream
+  version = "0.4.0";
+  src = fetchFromGitHub {
+    owner = "gumyr";
+    repo = pname;
+    rev = "v${version}";
+    deepClone = true;
+    hash = "sha256-+G+sjbRH8HbO8Gt6QRRjVQiwUNKTiqnGJdvjtTRFVgA=";
+  };
+in
+  buildPythonPackage {
+    inherit src pname version;
+    format = "pyproject";
+
+    nativeBuildInputs = [
+      git
+      pytestCheckHook
+      setuptools-scm
+    ];
+
+    propagatedBuildInputs = [
+      anytree
+      ezdxf
+      ipython
+      numpy
+      ocp
+      ocpsvg
+      py-lib3mf
+      scipy
+      svgpathtools
+      trianglesolver
+      vtk
+    ];
+  }
diff --git a/expressions/py-overrides.nix b/expressions/py-overrides.nix
index 0788bf1..8083bf0 100644
--- a/expressions/py-overrides.nix
+++ b/expressions/py-overrides.nix
@@ -49,4 +49,6 @@
   py-lib3mf = self.callPackage ./py-lib3mf.nix {};
 
   trianglesolver = self.callPackage ./trianglesolver.nix {};
+
+  build123d = self.callPackage ./build123d.nix {};
 }
diff --git a/flake.nix b/flake.nix
index a38ff91..c568b9f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -74,7 +74,7 @@
           cq-warehouse = python.pkgs.callPackage ./expressions/cq-warehouse.nix { };
         in rec {
           packages = {
-            inherit (python.pkgs) cadquery;
+            inherit (python.pkgs) cadquery build123d;
             inherit cq-kit cq-warehouse;
 
             cq-editor = pkgs.libsForQt5.callPackage ./expressions/cq-editor.nix {