The scaffolds were analyzed regarding their fiber spacing and fiber diameter using an Axio Zoom.V16 stereo zoom microscope (Zeiss, Vantaa, Finland) equipped with a Schott VisiLED MC 1100 light (Mainz, Germany). The data acquisition and analysis was conducted using the Zen image processing software version 3.8 (Zeiss, Vantaa, Finland). Fiber diameter was determined on at least 10 fibers and the mean value calculated. To analyze the fiber spacing (if applicable), distances between the stacked fibers in x and y direction was determined in at least 10 pores and mean value was calculated.