Fig. 3

Rheological, mechanical and degradation characterization of 3D-printed collagen scaffolds. Storage (G′) and loss (Gʺ) modulus of collagen scaffolds were determined from an amplitude sweep at 0.1 Hz, at a strain of 1% (A). The compressive Young’s modulus of collagen scaffolds was determined using an unconfined static compression at a strain rate of 5000 μm min^− 1 (B). Tests were performed on four different scaffolds. The mass changes of the collagen scaffolds and PEGDA scaffolds (C) were determined by weighting the dry mass of the scaffolds after printing and after 4 weeks in PBS; *p < 0.05