Best of both worlds, no plastic tabs that become loose over time yet the convenience of inline attachment.
No extra hardware other then the sponge needed.  Should work for 1.75 and 3mm filament.
Pinch filament between each half of a cut sponge and push all three in the small side and screw on the end cap.
Kitchen sponges seem to dry out, I have found that "Cellulose Facial Sponges" work well and are easy to find.  
3-17-15
Uploaded a thicker walled center component.  
4-10-15
Uploaded a version of outer portion that can thread on to the bottom filament guide of a Craftbot 3d printer.  
Check out my other designs: http://www.thingiverse.com/Kezat/designs

Dog hair, dust, and other small bits might get pushed through your extruder compromising, or completely wrecking a print. After designing a couple filters that were simple slotted cups, I wanted something a bit more refined and lightweight. So I modeled this. Has holes to drop in a bit of oil if need be.
Printed as one piece. Should hinge should be loose or break free with minimal force.
Timelapse: https://youtu.be/lVMvGldjXS0
If you this helps and want to encourage my insanity, buy a cup of coffee for me, a bag of coffee, or you pick the value. Thanks!