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
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.
Grégoire Saunier
2019-06-03 06:14:45 +0000 UTCThis 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.
Austin Vojta
2019-06-03 04:06:38 +0000 UTCWe 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.
Grégoire Saunier
2019-05-17 15:56:13 +0000 UTCThe 60 goes the other way.
Chris Warkocki
2019-05-17 14:04:34 +0000 UTC
