In-Line 3D filament cutter

When the filament chokes the inside of an extruder and an Automated Filament management system tries to retract the filament the whole filament pathway ends up under tension and breaking into it easily is not that easy. I have in the past pulled out the teflon tubing someway along its path until it stretches and exposes some filament and then cut thru that. Yes I know I could remove the extruder and then cut the filament choke point away inside the extruder but my printer is inside a chamber and I dislike working inside the chamber so was looking to make things easier so have made and inserted a simple filament cutter inline with the teflon tubing at the back of the CFS. The cutter is a printed block of PETG with two teflon tube fittings screwed into a 4mm hole running through the block and a slot (perpendicular to the hole) just wide enough to fit a razor blade to cut the filament which immediately releases the tension. I position the cutter along the filament line path just beyond the filament management system but it can be placed anywhere - even several could be used in the filament pathway.. Of course now that I have made this I will probably never need to use it 🤣 In the Image of the Cross section of cutter. "A" are 5mm ID holes and threaded using a tap to fit the M6 thread on the fittings. B is 4mm ID which holds a full length section of teflon tubing right up to the backs of each fitting. Then the tubing is cut with the razor blade.