FIGURE 5.

Fabrication of auxetic tubular microfibre scaffolds, fabricated via melt electrowriting, adopted from (Paxton et al., 2020): By using a tubular print bed, one of the axes of a conventional 3D printer is exchanged for rotating mandrel. In such a setup, the rotation speed has to be consistently adjusted with increasing numbers of layers to maintain stable printing conditions. Printing of auxetic structures lead to scaffold structure that increases in diameter (indicated in blue) when stretched (indicated in red).