Fig. 3. Preparation methods of regenerated silk fibers.

a Process flowchart for preparing regenerated silk fibers by using 3D electrospinning technology⁷⁶. Reproduced with permission from Elsevier (2016). b Schematic diagram of 2D electrospinning technology for regenerated silk fibers⁷⁷. Reproduced with permission from Elsevier (2014). c Schematic diagram of 3D printing technology for regenerated silk fibers⁷⁸. Reproduced with permission from Wiley (2019)