Loose Bowden Tube

I've been having this issue with the bowden tube in my extruder. It's loose and the push-fit grip might go at anytime.

Note the tape stuck to the bowden tube. Retraction and feeding moves the tube in and out.
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This is the second time this happened to me. The first time the push-fit wont grip the tube in the end anymore so I had to buy a new push-fit fitting. This time I put a choke on the push-collar so it won't move. Even with mod, it is happening again. Now I can't even remove the tube even if I push on the collar to release it.

I'm afraid I have to buy a new one and my tubing is getting shorter every time. Anyone solved this problem?

I use these from Ebay and they are excellent.

[www.ebay.com]

Agree with JMF here. I have some push-fits that have only 3 or 4 clamping "blades" in them that hold the PTFE tubing in place. The blades seem to break easily if the push-fit quality is questionable. Honestly, unless you're getting a good quality push-fit, consider these things consumables. Buy a few extra.

I can't speak to the ones with the Ebay link, but they look like the ones I use that have internal springs (so you don't have to do the choke thing) and have 8-10 little gripping blades in them (rather than the 2-3 on the cheaper brass ones.

Also, PTFE tubing is cheap, good to have extra on hand too.

Dave

Quote
triplanedave
Agree with JMF here. I have some push-fits that have only 3 or 4 clamping "blades" in them that hold the PTFE tubing in place. The blades seem to break easily if the push-fit quality is questionable. Honestly, unless you're getting a good quality push-fit, consider these things consumables. Buy a few extra.

I can't speak to the ones with the Ebay link, but they look like the ones I use that have internal springs (so you don't have to do the choke thing) and have 8-10 little gripping blades in them (rather than the 2-3 on the cheaper brass ones.

Also, PTFE tubing is cheap, good to have extra on hand too.

Dave

Yes the ones in the link have a spring in them and you have to really make an effort to get the tube out, these really work well.

Thanks guys.

I bought some with about a dozen "blades" inside to bite into the tubing and the collar has some spring action in it.

Hope this one lasts.