Ryobi 3 Gal. Vacuum P3240 HEPA Filter Adapter

This print allows a Masterforce Washable HEPA filter to be used with the Ryobi vacuum. The filter model number is WHCF and its Menards SKU is 2405252.

Ryobi doesn't seem to make a HEPA filter for it and although I've seen some try to use a Milwaukee M18/M12 HEPA filter, that filter seems to be just a little too tall and the washable version is more expensive.

To use this design, just print filter_adapter.stl, filter_cap.stl, and filter_ring.stl. You'll need to insert a 5/16"-18 x 1/2" hex bolt into the filter adapter and then snap it in to replace the original float ball basket with it. Place the filter ring on the foam using the tabs as a guide, slide the Masterforce filter over, and then screw the cap on to tighten the filter down.

I included a variant of the adapter called filter_adapter_spiral.stl that uses a different design. This didn't work as well as the filter_adapter.stl design for me (due to more curling of filament during printing), but I included it as an alternative.

The filter basket was held on sufficiently by the three tabs on the vacuum for me, but you could also choose to secure it further by using a zip tie or hose clamp. The filter ring provides a better seal by adding a continuous ridge between the rubber on the filter and the foam.