Summary

Have you ever been in a situation where you need a flat surface with dimensions grater than the print bed?

While the conventional solution is to use treaded inserts over lap joints, this provides a far more elegant and aesthetic solution.

The symmetrical component allows you to infinitely expand in both x and y directions.

Print at 15% infill with the surface along the bed.
No supports are required.
DO NOT try to print vertically as the fins will warp.