A direct-write nanomanufacturing technique is developed for the highspeed, continuous fabrication of micro- and nano-fibers made of soluble ionic solids in a low-humidity ambient environment. I he process IS based on the fast evaporation of solvent and the precipitation of solute in the nanoscale meniscus. Freestanding nanofibers, suspended or stacked nanofiber arrays, and even a continuously wound microfiber roll with a fiber length over 40 cm are fabricated.