Small Axial Flow Cyclone Dust Separator

I have a small Stepcraft CNC router in my house and to keep the noise down I use a small Miele cannister vacuum cleaner with a bag and a secondary HEPA filter on a low noise setting to capture the dust and particles from cutting.I needed a small dust separator to save space on my countertop. The vacuum bags fill up quickly without any dust collection.Cutting MDF generates particularly fine and light dust so a regular dust collector doesn't do a great job without high airflow and is too big for my space.The design here has a small collection container that can be quickly removed and emptied between jobs and realistically I couldn't fill it on one job anyway. If I use a clear bottle I can see how full it is.The cyclone has 4 parts.The outer tube constrains the airflow, it has a 28mm OD inlet which attaches to my CNC dust extractor tubeThe impeller has 4 blades and the air flows around the low drag teardrop shape without reducing the cross sectional area. The blade angle to airflo