In contrast, there is a noticeable difference when comparing the patterns printed with PVP10K and PVP360K (Figure ). While PVP10K led to more random packing in the center area, PVP360K induced side-by-side assembled nanorods, resulting in small domains of assembled monolayers several micrometers along the pattern. At a fixed concentration (1 mg/mL), PVP360K, due to its larger size, adsorbs onto the metal NP surfaces more effectively , promoting more organized assemblies which are energetically favorable (tip-to-tip, side by side). In contrast, PVP10K interacts weakly with the NP, leading to a less controlled assembly and random orientations Similar results for smaller nanoparticles (S-AuNR) are obtained when comparing the effect of PVP molecular weight: more side to side assembly in the center region of the ring with larger polymer size (Figure ). This supports a strong polymer size dependence on the resulting nanostructure of the printed assembly, regardless of the size of the NP.