  An inkjet printer head, which is capable of depositing liquid droplets with a
resolution of $22$ picoliters and high repeatability, is employed to
investigate the wetting dynamics of drops printed on a horizontal plane as well
as on a granular monolayer. For a sessile drop on a horizontal plane, we
characterize the contact angle hysteresis, drop volume and contact line
dynamics from side view images. We show that the evaporation rate scales with
the dimension of the contact line instead of the surface area of the drop. We
demonstrate that the system evolves into a closed cycle upon repeating the
depositing-evaporating process, owing to the high repeatability of the printing
facility. Finally, we extend the investigation to a granular monolayer in order
to explore the interplay between liquid deposition and granular particles.
