Modular 40mm NATO / RD40 canister adapter kit for Dirt Devil F2 HEPA filter
Description
For testing purposes only. Use at your own risk. Wanted to make a better adapter than my previous one. Made it in pieces so that it would be easier to customize and print. It comes in four pieces: 40mm.lid.stl - the top part with the rd40 thread. Support needed filter.adapter.stl - interfaces with the Dirt Devil F2 filter. Needs supports canister.stl - theaded cylinder to enclose the F2 filter. No support bottom.stl - bottom piece that threads on to cyllinder. Has hole for air intake. No support You will need to make your own gasket. I had rubber sheets on hand and it was easy to cut it out from a trace of the filter flange. The material is roughly equivalent to bicycle inner tube material. Initial fit and seal seems very good. My understanding is there are different flange heights depending on which brand F2 filter you have. I am currently using 3M Filtrete branded from Amazon. The threads attaching the pieces together should also be sealed to ensure that it is air tight. I am considering using caulk, teflon tape, hot glue, or silicone tape. V2 is my first working version. V3: I changed thread location on the filter adapter part. I think it's more stable, but now it will require supports to print. Use shorter V3 canister file for a more compact unit. ** 2020.06.25: I have just gotten "Green Label" brand filters from Amazon (4 for $12). They are noticeably inferior in quality compared to 3M (less pleat density 56 vs 40) and they are a tight ft on the adapter without any gasket. You could probably apply a thin layer of silicone caulk on the filter and that will be enough. ** 2020.06.26: uploaded v3 canister stl. ** 2020.07.06: added bot.plug.stl It's a press on cap for the intake hole at the bottom. I messed around with sealing with teflon tape and silicone for the large threads, but I think the easiest way was to just simply wrap the entire canister with transparent weatherseal tape that I already had from home depot. This way, you pretty much guarantee that the entire thing is airtight.
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