In this investigation the electric arc furnace steel dust (EAF dust) is used as a complement material in the additive manufacturing (AM) of clays. The AM technique used was the extrusion free forming (EFF) method. The addition of steel dust waste in the form of powder to the clay is beneficial to the environment because the residues can be immobilized and, therefore, can reduce the contamination of water. EAF dust is a hazardous waste available in millions of tons generated by the metallurgical industry. Different samples fabricated from clays were built with different water to clay ratios (W/C) and waste contents between 0 and 10%. Cylinders for compression tests were printed, then for one day in open air at room temperature, and thereafter exposed to 1100°C for 2 hours in air atmosphere. Materials characterization was conducted with scanning electron microscopy, compression, and density tests.