Bowden tube keeps slipping out | 3D Printing | Page 1

vocal path Feb 10, 2025, 4:33 AM

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I've used super glue, I've tried duct tape, I have epoxy resin sealed the darn thing. It just won't stay in there bro. Why? I can't afford to wait on a part does anyone know how I can keep this thing attached? 😩

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stray zincBOT Feb 10, 2025, 4:33 AM

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vocal path I've used super glue, I've tried duct tape, I have epoxy resin sealed the darn t...

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AI Help

It sounds like you are having difficulties keeping a part attached. Can you provide more details about the material you are trying to attach, the surface it is being attached to, and the specific issue you are facing? Understanding these factors will help in providing better guidance on how to solve the problem.

tame edge Feb 10, 2025, 4:33 AM

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You need a new coupler.

haughty depot Feb 10, 2025, 4:33 AM

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vocal path I've used super glue, I've tried duct tape, I have epoxy resin sealed the darn t...

js afford it

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its like a dollar

tame edge Feb 10, 2025, 4:33 AM

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The teeth on it are damaged and won't hold the tube.

vocal path Feb 10, 2025, 4:34 AM

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It's a time thing, there is no way to permanently attach it to the coupler? Why won't super glue hold on?

haughty depot Feb 10, 2025, 4:34 AM

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idk

tame edge Feb 10, 2025, 4:34 AM

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Because it's PTFE

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Its non stick

jovial wagon Feb 10, 2025, 4:35 AM

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Yeah, they have little teeth inside that will grip onto the tube, those can wear down over time.
You can try to repair the teeth inside by bending them a little, but honestly it's easier to buy a few

vocal path Feb 10, 2025, 4:35 AM

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I've gone through a few of them. Is there a better option than the little plastic ones?

jovial wagon Feb 10, 2025, 4:36 AM

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Do you remove the ptfe often or do you basically never touch them?

vocal path Feb 10, 2025, 4:36 AM

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I have to remove it everytime o change filament because the filament won't feed into the tube through the coupler.

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Like it's blocked up, but I can clearly see it's not. Also, thank you guys for such quick responses I did not expect to get such speedy advice

jovial wagon Feb 10, 2025, 4:37 AM

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That'll wear em down faster, my personal recommendation for a "longer" term solution is
New coupler and PTFE tube
Cut filament at a 45 degree angle and slightly bend it straight before feeding in
It should be relatively easy to feed into the tube

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As for right now, you can try to bend the little metal bits a little but shrug

vocal path Feb 10, 2025, 4:39 AM

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Thank you all so much. ❤️

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There are no teeth. So that's probably not good. Probably explains my my last extruder exploded. Guessing the teeth got dragged in there and clogged it up.

jovial wagon Feb 10, 2025, 4:47 AM

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blob_sweat I'd be seriously questioning where you purchased he PTFE couplers...

vocal path Feb 10, 2025, 4:47 AM

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It came with the creality printer

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Like stock coupler never replaced it in 2 years

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Alright so for now, I just melted the end of it with a lighter and shoved it in there. Got a new coupler and some other tubes ordered and on the way, hopefully it will do this print tho.

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Nope

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Like I get why the inside would be nonstick. That makes sense, but for what reason would the outside. The part that needs to be gripped, be nonstick? Like my goodness this is the most frustrating thing ever. I'm definitely upgrading to direct feed, this is so annoying.

jovial wagon Feb 10, 2025, 5:07 AM

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vocal path Like I get why the inside would be nonstick. That makes sense, but for what reas...

It is PTFE.
It is inherently anti-stick to an extent.

dense epoch Feb 10, 2025, 5:12 AM

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jovial wagon It is PTFE. It is inherently anti-stick to an extent.

To an extent is putting it very mildly

dense epoch Feb 10, 2025, 5:13 AM

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vocal path Like I get why the inside would be nonstick. That makes sense, but for what reas...

Its a tube...one material

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And get a new coupler and don't destroy it

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?pushfitting

stray zincBOT Feb 10, 2025, 5:13 AM

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https://www.youtube.com/watch?v=qtWLFKpItz8

YouTube

Duncan Rogers

Push In Fittings Explained

Push in fittings are suitable for compressed air and water systems and can be used with nylon or polyurethane tube. Easy to connect and disconnect.

For further information an to view our full range of push in fitting visit us at - http://www.airlines-pneumatics.co.uk/pneumatics/fittings/6

▶ Play video

dense epoch Feb 10, 2025, 5:14 AM

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vocal path Alright so for now, I just melted the end of it with a lighter and shoved it in ...

Oh god

tame edge Feb 10, 2025, 5:14 AM

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Ptfe smoke stare

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Dont melt your ptfe tubes

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Youre releasing toxins

dense epoch Feb 10, 2025, 5:15 AM

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If you feel nausea that won't go away after a few hours seek medical attention for "teflon-fever"

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Also you probably clogged that tube up good with this

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@vocal path

vocal path Feb 10, 2025, 5:22 AM

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dense epoch If you feel nausea that won't go away after a few hours seek medical attention f...

I would've seen the smoke right?

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Frick

dense epoch Feb 10, 2025, 5:23 AM

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Not necessarily

stray zincBOT Feb 10, 2025, 5:23 AM

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PTFE Temperatures
TL;DR: Do not heat PTFE above 230C for long periods of time, and never above 260C.

Polytetrafluoroethylene, a.k.a. PTFE, a.k.a. Teflon, is a polymer renowned for its extremely low coefficient of friction. It is used in many industrial and domestic applications, most famously in non-stick pans. Relevant to us, PTFE is used as Bowden tubing and heatbreak liners in 3D printers for ease of filament transport. This places the polymer in close contact with areas where high temperatures are routinely encountered.

PTFE will begin to pyrolyze at 220 degrees centigrade. It will begin off-gassing at significant amounts at 240. At 260, this process will have accelerated to the point where the structural integrity of your tubing will have been compromised. Most contemporary citations focus not on the physical decomposition of PTFE but on the health effects of byproducts used in its manufacture. However one major health risk is directly attributable to PTFE pyrolysis: Polymer fume fever.

Polymer fume fever, or colloquially "Teflon flu", is a condition caused by overexposure to fumes (over the course of 4-8 hours) caused by the decomposition of PTFE. The advanced respiratory metabolism of birds make them particularly sensitive to polymer fumes, which leaves them at high risk of death in environments where such fumes are prevalent. Further reading is linked below.

#Bowden tube keeps slipping out