The mechanical performance of 3D printed hierarchical honeycombs using carbon fiber and carbon nanotube reinforced acrylonitrile butadiene styrene filamentsMichel Theodor Mansour, Konstantinos Tsongas and Dimitris TzetzisMATEC Web Conf., 318 (2020) 01049DOI: https://doi.org/10.1051/matecconf/202031801049