About this 3D model
This is adapter for HEPA filter behind ventilation. Its designed for HEPA VACUUM SENCOR Filter. You can buy filter on this : https://www.amazon.de/-/en/SVX-013HF/dp/B00KXWLBL2 . I buy there: https://www.alza.sk/sencor-svx-013hf-d4525432.htm . Its really fit. The model has holes for 6x3 neodymium magnets. Which you stick in the holes with glue. I recommend printing at least PETG or ASA. When printing different materials, especially ASA , there is a big difference in air quality for me. Thank you for your feedback.