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Printed model structures using PEGDA and GelMA hydrogels. (a) The computer-aided design (CAD) model to be printed. (b) Printed three-layered structure from PEGDA (10 wt %) and (i), (ii) the zoomed images. (c) The model printed with 10 wt % GelMA and (d) with 20 wt % GelMA.
