Factories gotta build, it’s just what they do. It doesn’t matter if they construct components, elements, shapes, random widgets, snacks for the elder gods, robots, or star-sized constructs, they all start small and then scale upwards nearly forever as their output increases. Generally, though, they make one component out of another, assembling two or more pieces into a brand-new whole. Product goes into what’s functionally a black box, new product comes out after the assembler’s mysterious internal processes are complete. The recipes may be ridiculous at points (three steel pipes and eight spindles of wire make a single stator, Satisfactory?) but so long as the internal logic is good all is forgiven. Modulus, on the other hand, uses its factories to create voxel structures, and each cut and merge is internally consistent and all voxels accounted for.