  Self-assembly due to capillary forces is a common method for generating 2D
mesoscale structures from identical floating particles at the liquid-air
interface. Designing building blocks to obtain a desired mesoscopic structure
is a scientific challenge. We show herein that it is possible to shape the
particles with a low cost 3D printer, for composing specific mesoscopic
structures. Our method is based on the creation of capillary multipoles
inducing either attractive or repulsive forces. Since capillary interactions
can be downscaled, our method opens new ways to low cost microfabrication.
