Molecular inks are typically composed of small molecules that are coated onto a DPN tip and are delivered to the surface through a water meniscus.  In order to coat the tips, one can either vapor coat the tip or dip the tips into a dilute solution containing the molecular ink.  If one dip-coats the tips, the solvent must be removed prior to deposition.  The deposition rate of a molecular ink is dependent on the diffusion rate of the molecule, which is different for each molecule.  The size of the feature is controlled by the tip/surface dwell-time (ranging from milliseconds to seconds) and the size of the water meniscus, which is determined by the humidity conditions (assuming the tip's radius of curvature is much smaller than the meniscus).  
*Water meniscus mediated (exceptions do exist)
*Nanoscale feature resolution (50 nm to 2000 nm)
*No multiplexed depositions
*Each molecular ink is limited to its corresponding substrate