PTFE Cutting Tool (Patreon)

I recently made some investigation about the way PTFE must be cut and I am still not very happy with the answer I got, some explanation are missing to me. You can read about it in those tweets :
https://twitter.com/GregoireSaunier/status/1128384406886993921

Here is a PTFE cutter I designed made according to Prusa drawings. The angle on the side that goes into the heatbreak is 60°. The PTFE length is 50mm (compatible with 0.6.0 Bear extruder as well as future one, more on that later).

I would be really happy to get some feedback from you. As of today, the STL is only available for you dear patrons, I will wait few days before making it public.

WHAT YOU NEED

• 100mm PTFE tube
• Standard cutter like this one : https://tinyurl.com/yys77sv3
• Print the STL with 0.2mm height and 3 or 4 perimeters
• 60° countersink
  

HOW TO USE IT

• Cut the end of your PTFE straight.
• Insert the blade of the cutter inside the left slit with number "1". Make sure the blade is long enough to fulfill entirely the slit.
• Lock the blade in place with your thumb.
• Insert the PTFE and turn it clockwise to make a first cut.
• Remove the cutter.
• Insert the blade of the cutter inside the right slit with number "2".  Make sure the blade is long enough to fulfill entirely the slit. 
• Lock the blade in place with your thumb. 
• Insert the PTFE and turn it counter-clockwise to make a second cut.
• Remove the cutter.
• Cut the PTFE length using the third slit with number "3".
• On the PTFE flat side (the one you just cut using number "3"), make a 60° chamfer using the countersink.