QIDI Q2 fan duct - comparing alternative designs

My Q2 fun duct melted partially. Original parts were out of stock. Search for alternatives, provided some ideas and the need to compare alternatives. In this project, I compare the original QIDI fan duct design with some ideas that built up during the investigation. Also used an existing design ( https://www.printables.com/model/1510681-qidi-q2-fan-duct ) that seemed interesting to test. Check the attached PDF for details, results and conclusions. In the file you'll find the original QIDI fan duct files and the designs I created by modifying them.