Figure 10.

Multi-material bioprinting based on microextrusion technologies with multiple printing-heads [245, 357–359]. (A: Coaxial nozzles were design for gird construct with inner/outer layers. Reproduced with permission from Ref. [357] Copyright 2020 Wolters Kluwer. B: The design of microfluidic printheads with multiple inlets and an outlet, and the color-coded heterogenous construct. Reproduce with the permission from Ref. [358] Copyright Whioce Publishing. C: Microfluidic system (‘Y’ shaped channel) was used to flow two separate bioinks containing red and green fluorescent beads that through a single extruder. Reproduced with permission from Ref. [359] Copyright 2015 John Wiley and Sons. D: Bioceramic powders with F-127 solution and alginate were printed by extrusion printer with coaxial printing nozzle, followed by sintering to achieve mechanically stable construct. Reproduced with permission from Ref. [245] Copyright 2015 American Chemical Society.)