PC4 M8x1.25 Bowden Pneumatic Connectors  

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Steve Smith
(@steve-smith)
Trusted Member
Posted by: @timw-2

Just a heads up for anyone ordering the PC4-M8x1.25 connectors from AliExpress store DuoWeiSi mentioned earlier ( https://www.aliexpress.com/item/32967678995.html) : I received 20 of them today and the bore in the middle part is less than 4mm on all of them, it varies between 2.5mm and 3mm. It's nothing that a few minutes with a Dremel type tool won't fix but it's a bit annoying!

The two on the left I drilled/filed out, the three on the right are as they were.

Oh, and hello everyone! First post 🙂

Mine finally arrived today, shipping was super slow.. approx 11 weeks from Order.. but at least I got them... I also bought 20 from this store.. and none needed drilling.. 

My Mini has: A SuperPINDA + Bondtech Heatbreak + Bondtech Extruder installed...
Posted : 09/02/2021 4:29 pm
karl-herbert
(@karl-herbert)
Illustrious Member

@steve-smith

Cheap, a pig in a poke and often extremely long delivery times. But sometimes you are also in luck. I also shopped there and had to rework as well.

PC4_M8x1.25

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 09/02/2021 5:38 pm
tex
 tex
(@tex)
Active Member

Can someone just confirm they're using these successfully with the stock Mini hotend?  I've tried replacing all three bowden tubes with one continuous piece using PC4 connectors and I can't print anything without a jam in the heatbreak:

 

 

I'm not sure what's going on, the tube must be pulling out a few mm though it doesn't seem like it has any slop in it...

Posted : 17/02/2021 4:47 am
karl-herbert
(@karl-herbert)
Illustrious Member

@tex

You probably got a bad PC4 connector. Some have too insufficient grip to hold the PTFE tube in place. The PTFE is pushed back by the extruder feed and this causes a gap, which is also shown by your filament tip.

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 17/02/2021 9:03 am
TimW
 TimW
(@timw-2)
New Member

@tex

I had the same issue, I took the Prusa approach and cut a piece of tube to go between the PC4 connector and the hot end which seems to be ok. I'm not sure there's much advantage with it like this though so I'll probably put it back to stock.

Posted : 17/02/2021 9:39 am
cwbullet
(@cwbullet)
Illustrious Member

@tex

I am.  I had to replace the clip to ensure it locked in place.  

--------------------
Chuck H
3D Printer Review Blog...
Posted : 17/02/2021 11:38 am
cwbullet
(@cwbullet)
Illustrious Member

@karl-herbert

My guess also.  I had to replace the clip one and the PC4 the other.  

--------------------
Chuck H
3D Printer Review Blog...
Posted : 17/02/2021 11:38 am
karl-herbert
(@karl-herbert)
Illustrious Member

Of course, I can only speak from my E3D V6 installation with PTFE throughout. The PTFE does not shift a millimeter. The important thing, as chuck mentioned, is that a suitable locking clip is mounted on the heatsink head.

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 17/02/2021 6:47 pm
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