Custom 3D Printable PCB Enclosure

I need a robust, good-looking enclosure for a custom-sized PCB that I will be printing on a standard FDM printer. The project is strictly an electronic housing, not a generic mechanical case, so component clearance, connector access and airflow all matter... (Budget: $30 - $250 AUD, Jobs: 3D Design, 3D Modelling, 3D Printing, AutoCAD, CAD/CAM, Fusion 360, Product Design, Solidworks)