Grégoire Saunier
patreon
PTFE Cutting Tool
🕑 Added 2019-05-17 10:13:50 +0000 UTCI 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.
Comments
Grégoire Saunier
It probably depends more on the cutter you are using, step 2 goes deeper but might be hard to use at first. Also if PTFE is short it is hard to turn in step 2.
Austin Vojta
This PTFE cutter worked great for me! No issues. But I'm not sure the difference between stage 1 & 2... I accidentally didn't look at the numbers at first, just used stage 2 and 3, and that turned out fine.
Grégoire Saunier
We solved that point out of Patreon but just to make it clear for others: - Nope my 60° angle is correct, I checked with Prusa support. - Prusa support confirms that the specs online are the correct ones. - Apparently Prusa was having manufacturing errors and several people received PTFE with a wrong angle. - It looks like that latest orders comes with the 60° like my tool and like the specs.
Chris Warkocki
The 60 goes the other way.
