Inside Cover

Microfluidics are key tools for designing uniform polymer microgels via emulsion templates, although usually limited to microliter quantities. 3D printing forms a promising basis to fabricate flow cells in a single process step, enabling the integration of various functional microfluidic units in one device, e.g., to address the demand for large quantities of microgels for particle-based inks in extrusion-based 3D printing or for constructing supragels. Here, parallelized droplet formation and splitting are combined in one reusable 3D-printed flow cell to form polymer microparticles at milliliter-per-hour scale. Cover art designed by Martin Schumann. (DOI: 10.1002/pol.20230213)