Integrating 3D-Printed Badges and Readiness Quizzes to Enhance Engagement in a Flipped Learning Manufacturing Technology Course - Pernia-Espinoza, Alpha; Lopez-Fernandez, Daniel; Sanz-Garcia, Andres; Martinez-de-Pison-Ascacibar, F Javier (INNOVATION VIA COLLABORATIVE LEARNING IN ENGINEERING EDUCATION, ICL 2025, VOL 2, 2026)