Krown Designs
Krown Designs sells mycelium supplies in Europe, as well as selling their own mycelium furniture, lamps, and accessories.
This video showcases a 3d printed chair that was made using PLA (polylactic acid), a bioplastic, that they 3d printed in hollow pieces and filled with mycelium. They did not kill the fungus, so the mycelium strengthened the piece and continued to grow, resulting in the formation of mushrooms.