What angle did you use to trim the PTFE tube external chamfer when replacing the Prusa V6 heatbreak with a standard V6 heatbreak?
 
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[Solved] What angle did you use to trim the PTFE tube external chamfer when replacing the Prusa V6 heatbreak with a standard V6 heatbreak?  

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kennd
(@kennd)
Estimable Member
What angle did you use to trim the PTFE tube external chamfer when replacing the Prusa V6 heatbreak with a standard V6 heatbreak?

I received my new MK3S kit (#2) and I have been gathering the components that I am planning to use instead of the 'stock' parts in the kit as well as printing some parts (bearing holders, etc.). My first MK3S is great, but there are some things I want to change while building this one.

 

I have all the parts and 99% of the information I need to continue.

 

First and foremost is replacing the Prusa stock heatbreak with a titanium T6.... alloy one from Spool3d,or an E3D titanium T5... alloy one. The T6 alloy is supposed to conduct heat much slower than the T5 alloy.

 

Have you had experiences with either, good or bad?

 

The 1% that I am missing is the external bevel (chamfer) of the PTFE tube where it sits in the heatbreak. The infernalnet provided 4 different angles; 45, 60, 120 and 90 degrees.

 

Even theE3D website shows differences. The engineering diagram shows a deburred 90 degree seat in the heatbreak and another diagram shows an undefined bevel. One old article said to cut the tube at 90 degrees. I will have to print @area51's PTFE Tube Chamfer and Cut Jig and cut some at different angles and get out the lamp black to check.

 

What angle have you used successfully?

Kenn

Best Answer by kennd:

Thanks for sharing your experiences.

 

I send an email to both E3D and Sool3D at about 1:00 AM PST as I bought a heatbreak from each. Honestly, my expectations were not that high. I expected to wait a long time for a response, if any. They both blew my expectations away. E3D replied in about 45 minutes and I had a reply from Spool3D when I woke up( <8 hours).

 

The answer that both gave for their titanium heatbreak was that the PTFE tube should be cut at 90 degrees.

 

This gives me a good starting point and now I can make an informed decision on how to proceed. Combined with your responses and theirs I have the information I need to choose what is best for me.

 

 

I do not blindly follow “the rules” as indicated in my posting on March 11 2019 where, against the rules and advice, I chose to mount my Y-axis bearings rotated 45 degrees from the assembly manual instructions.

 

The choice to use the existing bevelled PTFE tube, or a new one with no bevel is everyone's personal choice and if it works for you, then it is the right choice, no matter what everyone else says.

 

Kenn

 

Quality is the Journey, not the Destination
MK3S, Nylock mod, Modified Y-axis bearing mounting
MK3S kit waiting to be assembled (still)
Primary CAD program: Trimble Sketchup Make 2017(standalone) with 3D extensions
My limited prints on Prusaprinters.org...
Posted : 13/10/2020 1:47 am
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(@)
Illustrious Member
RE: What angle did you use to trim the PTFE tube external chamfer when replacing the Prusa V6 heatbreak with a standard V6 heatbreak?

The bevel on the drawings isn't specified, but looks like 45. And I'd also assume the titanium is milled the same as the ss drawing that I've linked.

https://e3d-online.dozuki.com/Document/I2woGboCqjNEBkIx/V6.8-Heatbreak.pdf

In the end, E3D is very helpful if you email them.

Posted : 13/10/2020 3:54 am
g monkey
(@g-monkey)
Trusted Member
RE: What angle did you use to trim the PTFE tube external chamfer when replacing the Prusa V6 heatbreak with a standard V6 heatbreak?

I replaced the standard heatbreak with the E3D titanium one.  I reused the same stock PTFE tube, with whatever angle it was cut with (looked to be around 45 degrees).  It all seems to be working ok, no leaks to report.

Posted : 13/10/2020 2:07 pm
bobstro liked
bobstro
(@bobstro)
Illustrious Member
RE: What angle did you use to trim the PTFE tube external chamfer when replacing the Prusa V6 heatbreak with a standard V6 heatbreak?
Posted by: @rh_shop

I replaced the standard heatbreak with the E3D titanium one.  I reused the same stock PTFE tube, with whatever angle it was cut with (looked to be around 45 degrees).  It all seems to be working ok, no leaks to report.

I had the same experience. Just reused the same original PTFE tube with an E3D Titanium heatbreak.

 

My notes and disclaimers on 3D printing and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan...
Posted : 13/10/2020 2:31 pm
kennd
(@kennd)
Estimable Member
Topic starter answered:
RE: What angle did you use to trim the PTFE tube external chamfer when replacing the Prusa V6 heatbreak with a standard V6 heatbreak?

Thanks for sharing your experiences.

 

I send an email to both E3D and Sool3D at about 1:00 AM PST as I bought a heatbreak from each. Honestly, my expectations were not that high. I expected to wait a long time for a response, if any. They both blew my expectations away. E3D replied in about 45 minutes and I had a reply from Spool3D when I woke up( <8 hours).

 

The answer that both gave for their titanium heatbreak was that the PTFE tube should be cut at 90 degrees.

 

This gives me a good starting point and now I can make an informed decision on how to proceed. Combined with your responses and theirs I have the information I need to choose what is best for me.

 

 

I do not blindly follow “the rules” as indicated in my posting on March 11 2019 where, against the rules and advice, I chose to mount my Y-axis bearings rotated 45 degrees from the assembly manual instructions.

 

The choice to use the existing bevelled PTFE tube, or a new one with no bevel is everyone's personal choice and if it works for you, then it is the right choice, no matter what everyone else says.

 

Kenn

 

Quality is the Journey, not the Destination
MK3S, Nylock mod, Modified Y-axis bearing mounting
MK3S kit waiting to be assembled (still)
Primary CAD program: Trimble Sketchup Make 2017(standalone) with 3D extensions
My limited prints on Prusaprinters.org...
Posted : 16/10/2020 7:25 pm
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(@)
Illustrious Member
RE: What angle did you use to trim the PTFE tube external chamfer when replacing the Prusa V6 heatbreak with a standard V6 heatbreak?

I think the 45 vs 90 is the half vs full angle of the tip.  90 would be a straight perpendicular cut across the tubing - which is obviously wrong.

0 = |

45 = /

90 = _

However 

45 = \ + 45 = / == 90

 

Posted : 16/10/2020 9:03 pm
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(@)
Illustrious Member
RE: What angle did you use to trim the PTFE tube external chamfer when replacing the Prusa V6 heatbreak with a standard V6 heatbreak?

ps: if the metal heat break has a bevel, and you use a straight cut unbeveled PTFE tube, your hot end will trap debris that falls along the filament path - this debris can and will snag the filament at the heat break / PTFE interface.

Posted : 16/10/2020 9:12 pm
kennd
(@kennd)
Estimable Member
Topic starter answered:
RE: What angle did you use to trim the PTFE tube external chamfer when replacing the Prusa V6 heatbreak with a standard V6 heatbreak?

neither heatbreak has a bevel

Quality is the Journey, not the Destination
MK3S, Nylock mod, Modified Y-axis bearing mounting
MK3S kit waiting to be assembled (still)
Primary CAD program: Trimble Sketchup Make 2017(standalone) with 3D extensions
My limited prints on Prusaprinters.org...
Posted : 16/10/2020 9:16 pm
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(@)
Illustrious Member
RE: What angle did you use to trim the PTFE tube external chamfer when replacing the Prusa V6 heatbreak with a standard V6 heatbreak?

@kennd

neither heatbreak has a bevel

Not true if you trust the E3D documentation:

https://e3d-online.dozuki.com/Document/I2woGboCqjNEBkIx/V6.8-Heatbreak.pdf

And here's the Prusa version with the step mod.

 

 

 

This post was modified 11 months ago by --
Posted : 16/10/2020 11:26 pm
kennd
(@kennd)
Estimable Member
Topic starter answered:
RE: What angle did you use to trim the PTFE tube external chamfer when replacing the Prusa V6 heatbreak with a standard V6 heatbreak?

fine

Quality is the Journey, not the Destination
MK3S, Nylock mod, Modified Y-axis bearing mounting
MK3S kit waiting to be assembled (still)
Primary CAD program: Trimble Sketchup Make 2017(standalone) with 3D extensions
My limited prints on Prusaprinters.org...
Posted : 17/10/2020 8:41 am
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