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. 2022 May 30;20(6):366. doi: 10.3390/md20060366

Figure 4.

Figure 4

3D extrusion printing of collagen hydrogels. (A,B) MPC 3D printed scaffolds, at 1 and 2 layers (scale bars are 200 and 100 µm, respectively). (C,D) MMC 3D printed scaffolds, at 1 and 2 layers (scale bars are 200 and 100 µm, respectively). (E,F) Schematic showing the conditions that MPC and MMC are able to be extrusion printed with a 22 G nozzle. The red zones represent conditions that are not suitable for 3D extrusion printing, the yellow show possible conditions, and the green zones show ideal conditions (G,H) show the fibre diameter achieved at varying speeds (pressure fixed at 20 kPa) and variable pressure (speed fixed at 10 mm/s).