Abstract: There is provided a process of preparing at least one fiber structure comprising: (a) contacting at least one viscous material with at least one non-solvent, the non-solvent having a first flow rate; and (b) allowing formation of the fiber structure in the presence of the non-solvent at a second flow rate, wherein the second flow rate is less than the first flow rate or is about zero. There is provided a process of preparing at least one fiber structure, wherein the fiber structure is a fiber scaffold, comprising: (a) contacting at least one viscous material with at least one non-solvent, the non-solvent having a first flow rate; and (b) obtaining at least one fiber and assembling the obtained fiber(s), or allowing the obtained fiber(s) to be assembled, in the form of a fiber scaffold. There is also provided a fiber structure obtainable by any process according to the invention and an apparatus for preparing a fiber structure.