The Evaluation of Sandwich Composite Materials with Vegetable Fibers in a Castor Oil Polyurethane Matrix with Their Faces and Honeycomb Core Made in a 3D Printer - Pino, Gilberto Garcia del; Bezazi, Abderrezak; Kieling, Antonio Claudio; Macedo Neto, José Costa de; Garcia, Sofia Dehaini; Valin Rivera, Jose Luis; Valin Fernandez, Meyli; Torres, Aristides Rivera; Valenzuela Díaz, Francisco Rolando (Polymers (print), 2024)