Volumetrically bioprinted models with additional negative features (open perfusable channels). Branched vasculature (i) CAD model and (ii) light sheet scan reconstructions, digitally cropped to the central region to facilitate 3D visualization of the hollow features. Pancreas models with duct, (iii) CAD model, and (iv) light sheet scan reconstructions. Scale bars: 3 mm. Stereomicroscopy image of (vi) test print model: a hollow circular structure with a thin wavy central strut measuring obtained via volumetric printing of the bioresin formulation obtained after milling for 90 s, with a (vi) close-up image to highlight the particulate nature of the constructs, and a (vii) 3D reconstruction of the particulate/porous network microstructure. Scale bars: ii,iv,v = 2 mm; vi = 500 µm.
