Filter stop

I'm using the Quick Change Filament Filter by rcolyer (https://www.thingiverse.com/thing:1686846) for quite a while now, it's great!

However, I had two small issues with it:
1. The filament may get stuck in the side slot.
2. The filter is hanging from the filament, so its weight slightly pulls the filament in the wrong direction.

So I made this small addition, that plugs the side slot and clamps to your bowden tube. Problems fixed!