Buffer Ram Sensor Enclosed Filament Path

I like the design and prefer the compression spring instead of using rubber bands so I made a minor modification to fix the filament path. Sometimes my filament would fold over or snap into pieces like is shown in the picture below. I also prefer to use a weaker compression spring instead of random Amazon parts. I use a 30mm x 5.5mm x 0.5 mm, part number 94125K428 from McMaster-Carr. You just have to take care of the install sequence, because the one-way ECAS04 fitting will allow you to push the PTFE tube too far. I pinch the shuttle in place so it cannot travel and then install the PTFE tube until it bottoms out. Then I slide the shuttle across its full working range to make sure the PTFE tube never catches the shuttle wall during traveling. Position 1: Position 2 after 19mm of travel: This way the shuttle bottoms out before the PTFE tube exits the shuttle and the filament stays straight. If you push the PTFE tube too far during installation then the spring will compress too early and you will lose travel range. I added a cut-out in the rear so you can see the position of the shuttle at all times. If your shuttle doesn't touch each end then you know its travel range is compromised.