Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:3435678.

I have a Ryobi 18-Volt ONE+ Lithium-Ion Cordless Underwater Stick Vacuum (P3500K). The filter that comes with the vacuum doesn't do a very good job when cleaning the fine silt in the pool. Sooooo I design an adapter to use an ultra-fine coffee bag and it works pretty well. If you can find a similar size bag with a higher micron rating if the one below doesn't work out for you.

Parts Needed:

1 x Cold Brew Coffee Bag - 8.6"X5" Ultra Fine Mesh-75 Micron Filter Bag (#ad) https://is.gd/N0ujI6

Updated - 05/04/19: Added RyobiPoolVacuum_FilterAdapter_WithSupports_v2.stl - Adjusted the model to prevent larger escaping.