For most of our FDM prints we use a lignin material. Lignin is a biopolymer, a macromolecule synthesized in plants’ cells. It makes us knock on wood. In addition to cellulose and hemicellulose, lignin forms twenty to thirty percent of the wood cell wall substance. It primarily provides plants with stability, especially compressive strength. In addition, lignin prevents the biodegradability of cellulose in these organisms. As gathering the lignin from wood means applying energy, we decided to use scrap wood material as a filler to improve the tensile strength and lower the CO2 footprint of our material even more.