Two approaches for thermal imprinting optical structures into the surface of agZIF-62 were tested. The first approach included simultaneous melting of ZIF-62 and surface micro structuring at ~450 °C, in the region of the melting temperature of the crystalline ZIF-62, Tm(ZIF-62) . In this case, gently grinded crystals were externally pressed between a glass slide from one side, and the 3D-printed template on a substrate from another side. This approach proved insufficient, as pressure applied to form a single glass piece appeared to be too high for the relatively brittle microstructures, which inevitably led to damaging the template, detaching of its elements and even glass cracking through induced strain (Figure ). However, even with this approach the general ability of 3D imprinting into the agZIF-62 surface was clearly observed, as some structures were still thermally transferred (Figure ). The second approach (Figure , SI) used a post-processing technique of agZIF-62 films prepared beforehand. Here, the template was placed on the top of agZIF-62 substrates and then heated up to 400 °C. Gravity and viscous flow led to imprinting of structures. Initial tests showed that at this processing temperature, the weight of the substrate itself was sufficient to shape the surface, and no additional external pressure was required for imprinting (Figure ; this was deemed beneficial for retaining the porosity of the initial agZIF-62 also after remelting ); also, neither template nor glass were damaged in this process and could be readily detached without leaving residual stress or strain in the material. The second approach was therefore applied in all further experiments.