This is version 2 of the cardboard miter-saw dust box, and I think it's a 99% solution. For background, I pulled my miter saw away from the wall to do some cleaning and maintenance, and decided to upgrade the dust collection at the same time. It would be ideal to just install perfect dust collection for the entire workshop all in one shot, but I think for most of us it's a life-long process of gradual upgrades. This is a prototype, so I didn't see any reason to commit to a wooden structure just yet. Cardboard is free, easy to work with, and would last for many years.

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These are some of the materials I used, excluding the TV:
Rockler 2-1/2" stretch hose: https://amzn.to/3akvSJY
4” black corrugated snap coupler: https://amzn.to/3bR03uM
100mm Dust Shoe Brush: https://amzn.to/3crlOS7
100mm Dust Shoe Brush (2 pack): https://amzn.to/3rd9rgn

This is the 4" stuff that was already on my dust collector:
Rockler 4” stretch hose: https://amzn.to/38VGuQ5
Rockler threaded disconnect fitting: https://amzn.to/3nW9mvu
4” hand-keyed hose clamps: https://amzn.to/38Vf6Bv