Turn your empty filament boxes into easy to grab storage spots!

I made this to help with reusing the Inland brand filament boxes for storage/organization needs. They're great boxes to store things on a shelf and these help with pulling them off the shelf: rather than try to pull on the edge of the color-view window to pull the box off a shelf, pop this part into the window to give a nice place to hold on to without fear of paper cut, and also to prevent ripping the cardboard since there's a lot more contact area. It's tight and takes a little work to get it in place but I wanted it that way - just start on one end and from the inside of the box push the box wall in around the oval until it's all in!