Fill with activated carbon to filter VOCs and odors from 3D printer exhaust. I made this specifically for the Qidi Q1 Pro. It fits in the external holder you can find here. https://makerworld.com/en/models/411229?fbclid=IwZXh0bgNhZW0CMTEAAR3f0M9DgXlkferK0tAFzDghmkW5zvwlpZ_0zBMjcjAj5kIBMrbzlP3vYic_aem_Yo-cguwd-8sszccZO92pzQ#profileId-313181
I made the grid open for max airflow. Others I had seen were quite restricted. Openings are 2mm x 5mm. Overall size is 60mm x 60mm x 33.3mm
If you want to keep the heat in your printer you can print the close off part I made here. https://www.printables.com/model/943829-plug-to-close-off-exhaust-on-the-qidi-q1-pro
The author marked this model as their own original creation.