Although a modern exterior chimney is often just a straight shaft, older chimneys reflect their interior kitchen-sized hearths with multiple width changes to the profile. The Guardhouse (below left) has a fairly simple chimney that hugs the building wall. The Market Square Kitchen (below middle) has an offset between the upper flue and the peak section of the roof. The Mary Stith Shop (below right) has two flues. This section covers simple exterior chimneys. The next section covers multi-flue or offset chimneys.
The first step is to produce a profile of the chimney. This can be built of blocks (below left) that are then welded (below middle left and right) to produce a basic shape. Point editing is then used to make the sloped “shoulder” sections (below right). Notice that this particular chimney is not symmetrical.
The back profile can be produced by duplicating the front shape and flipping it horizontally. The sides must correspond to the bends in the profile of the basic shape. Draw a long rectangle the width of the side face of the chimney. A series of fold lines will be placed along this rectangle separated by the lengths of the straight and sloped edges of the profile. Since this example is not symmetrical, the two side elements must be produced separately. The only thing in common will be the width. Then apply a brick pattern for the chimney and a gradient for the topper.
If desired, add a tab to the front profile to allow it to be glued to the base of the model.