Why odd and even dimensions build differently
An odd width has a single center block, while an even width has a center gap between blocks. That changes symmetry, entrances, walls, and how multiple layers line up. Choose the dimensions based on the structure you want, not only on the outside diameter.
The highlighted build guide is most useful when you complete one row or layer at a time. Marking progress reduces mirrored mistakes on large circles, domes, and spheres.