Abstract: A 3D printing apparatus can include a base composite material channel configured to pass a base composite material therethrough, a fiber strand channel configured to pass a fiber strand therethrough, and a fiber feeding component configured to feed the fiber strand through the fiber channel. The fiber strand can be separate from the base composite material before entering the 3D printing apparatus, and the fiber feeding component can facilitate combining of the fiber strand with the base composite material to form a layer of a 3D printed building component with the fiber strand within the base composite material. An impregnation material channel may be included to pass an impregnation liquid or material to impregnate the fiber strand while the fiber strand is within the 3D printing apparatus.

Abstract: A composition of 3D printable photocurable material can include acrylate monomer(s) between about 0-30.0 composition wt %; acrylate oligomer(s) between about 0-30.0 composition wt %; photoinitiator(s) between about 0.02-1.0 composition wt %; chopped fiber(s) between about 0.1-3.0 composition wt %; flame retardant(s) between about 2.0-20.0 composition wt %; processing aid(s) between about 0.05-3.0 composition wt %; additive(s) between about composition 0-3.0 wt %; and filler(s) between about 20.0-80.0 composition wt %. The composition can have a viscosity of about 10,000-300,000 mPa·s, can be configured to be extruded at a printing speed of about 7-90 cm3/s during 3D printing, can be photopolymerized under UV or visible irradiation at a material depth of about 4-8 mm, and can be cured to form a building construction material.

Abstract: A 3D printing apparatus can include a base composite material channel configured to pass a base composite material therethrough, a fiber strand channel configured to pass a fiber strand therethrough, and a fiber feeding component configured to feed the fiber strand through the fiber channel. The fiber strand can be separate from the base composite material before entering the 3D printing apparatus, and the fiber feeding component can facilitate combining of the fiber strand with the base composite material to form a layer of a 3D printed building component with the fiber strand within the base composite material. An impregnation material channel may be included to pass an impregnation liquid or material to impregnate the fiber strand while the fiber strand is within the 3D printing apparatus.