Additive manufacturing technologies have achieved great development in last decade on area of technology and printing materials. Special emphasis is placed on the development of materials that would be cheaper, from natural sources, without releases of harmful substances during the manufacturing process and usage, with the possibility of using waste materials and recycling after service life. Wood or wood residues are one of the potential raw materials that could be used for 3D printing in combination with natural and synthetic polymers. It is anticipated that with the development of additive technologies, the use of wood-plastic composites will also expand to the area of structural elements, for example, in the construction of prefabricated houses. The fire behaviour of 3D printed wood/PLA specimens was determined according to ASTM E 2058 standard and microscale combustion calorimetry (MCC) with ASTM 7309-13.