Fig. 3

a, b Filament collapse tests (nozzle diameter 1.2 mm, layer height 1.0 mm): optical images of filaments extruded from a mycelium-alginate composite and b pure alginate gel. c Stackability tests: optical images of objects (see Fig. 9b) printed with the F71A29 paste with 10, 20 and 30 layers (nozzle diameter 1.6 mm, layer height 1.3 mm, printing speed 10 mm/s)