Union and difference

The Builder in itself is adding each element to the other (or subtracting it) according to the parameter choosen for the object created.

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from build123d import *
from ocp_vscode import *
set_defaults(reset_camera=Camera.KEEP, black_edges=True,center_grid=True)

with BuildPart() as TestPart:
    # Creates a Box
        Box(6,5,3)
    # Subtracts a cylinder
        Cylinder(radius=2,height=4,mode=Mode.SUBTRACT)
    # Subtract a Torus
        Torus(major_radius=5,minor_radius=2)

show_all()

The mode=Mode.ADD is the default that's why it is not needed to write it again.

Now what if we constructed two parts and want them to add together?

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from build123d import *
from ocp_vscode import *
set_defaults(reset_camera=Camera.KEEP, black_edges=True,center_grid=True)

with BuildPart() as TestPart:
    # Creates a Box
        Box(6,5,3)
    # Subtracts a cylinder
        Cylinder(radius=2,height=4,mode=Mode.SUBTRACT)
    # Add a Torus
        Torus(major_radius=5,minor_radius=2)

with BuildPart() as TestPartII:
    # Add a Torus
        Torus(major_radius=5,minor_radius=2)

with BuildPart() as AllTogether:
    # Add Box
    add(TestPart)
    # Add Torus
    add(TestPartII)

show_object(AllTogether)