This file only includes the Filament Filters designed to integrate with Rammeh's Advanced Flashforge Finder Filament Reel Holder (https://www.thingiverse.com/thing:2625213) - you'll need to download/print the Reel Holder separately.
After building Rammeh's Filament Reel for our Finder, I wanted to add a filament dust filter to minimize any dust transit to the extruder. Tried a few of the more popular designs and was non-plussed, decided to whip up a model that more closely integrates with the Holder's filament armature.
Two models are included - Basic & Quick-Change. If you're a 'set it & forget it' type, Basic provides the best overall dust enclosure - add a bit of filtration foam & drive the filament up & through. If you're in a really dusty home or shop & need to clean your foam more often, the Quick-Change model is easy to twist on & off as needed.
Using FlashPrint, I'm printing bottom-up with linear supports, which are easier to clean out on something this scale. Use pliers to crunch out the interior supports, and carefully crunch the supports around the support arm to remove them - the arm can be easily broken off if you're too aggressive. I use a needle file to true-up the filament hole on top before attachment. Marginally easier to print down on its side (arm side down), but found the supports in the interior more difficult to remove in this orientation even though there were fewer - YMMV.
Set a small cube of filtration foam into the respective filter body (I'm using trimmings from an unused foam paintbrush - dense enough to catch dust but doesn't require lubrication like the sponge models) and drive the filament up through the hole bottom-up (Basic model), or make a single cut a little more than halfway through the foam to create a channel you can slide the filament into (Quick-Change model).
Once on, slide up to the bottom of the Reel Holder's filament armature and twist counter-clockwise to seat around the tube as shown in the photos.