Fig. 1

AUPPEG scaffolds. A Model compound of an AUPPEG polymer. For the backbone, PEG4k, 8k and 10k were used. B Light microscope images of 3D printed AUPPEG scaffolds with 3 different backbone lengths. Printing parameters are adjusted to have similar dimensions in swollen state. Scale bar 200 µm. C Indentation measurements of swollen AUPPEG scaffolds with different backbone lengths (p < 0.01) and human healthy and tumor tissue. Horizontal line indicates the median stiffness of normal (16 kPa) and tumor tissue (56 kPa) (p < 0.01). D Table with physical parameters of the AUPPEG scaffolds with the different backbone lengths