This is for the Monoprice MP Select Mini, a filament guide and filter combined.
So this is my first creation, it's sort of a remix I guess, but something new really as I had to do quite a bit of work to make it all work correctly. I used Meshmixer and took two parts and created single part that I wanted. I liked both parts and actually put them together manually with glue and a screw but I decided I wanted to created a new part altogether.
This combines these two:
Monoprice MP Select Mini Filament Guide
http://www.thingiverse.com/thing:1776779
Filament Dust Filter
http://www.thingiverse.com/thing:190118

I combined these but had to do extra work to make it fit correctly. When I created the first one I had to cut and melt and bend to fit everything together, but now I just took all of that knowledge from that build and came up with this combo for the MP Select Mini.

You will find the filter box is tight to open, it's made that way as just opening and closing it a few times will loosen the clasp. You don't want the clasp very loose as I found that the filament can actually pop the box open.

Edit: I uploaded another STL file with a larger hole in the back section of the top of the box. I had forgot to enlarge the hole there. Because of the angle of the filament going in it tends to rub, this should fix that now.