By using a 3D printer in unusual way, interesting randomized "CA-like" patterns are generated (see this video). When the grids are relatively sparse, filament sometimes stacks regularly and sometimes stacks randomly.
In this first photo, the grids are sparse. The filament seems to be stacked sometimes randomly and sometimes regularly. The yellow circles in the figure below show "randomly" stacked filament, and the green circles show "regularly" stacked filament. However, the only difference may be the amount of filament.
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