Volumetric printing has recently emerged as a powerful technique for rapid 3D (bio)fabrication, which avoids the layer-by-layer stacking and thus, does not require low viscosity of the resin or high mechanical strength of the printed object. Therefore, we tested the printing of PEGDMA 8k at 50% water content on a tomographic volumetric printer. Prior to the printing, the photocrosslinking efficiency of PEGDMA water-borne resins were evaluated by in situ photo-rheology under UV irradiation at 365 nm (Figure ). Although volumetric printing is much faster, when compared to heat-assisted DLP, it was not possible to achieve good printing quality of the bone model. The model was further modified to expand the size of the microchannel by ~4 folds to eventually enable the printing, as shown in Figure . This test further confirmed the great advantage of heat-assisted DLP in highresolution 3D printing of structurally complex hydrogels.