Design and validation of an innovative 3D printer containing a co-rotating twin screw extrusion unit - Justino Netto, Joaquim Manoel; Sarout, Amir Ilkiu; Santos, Andre Luiz Grando; Lucas, Alessandra de Almeida; Chinelatto, Marcelo Aparecido; Alves, jorge Lino; Cunha, António Gaspar; Covas, José António; Silveira, Zilda de Castro (Additive Manufacturing, 2022)