I am wondering if anybody has seen a connection like I am pointing to on the extruder end for the extruder end?
I would love to be able to pull things apart like this. It is away from the activity end so shouldn't be a problem.

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Replikeo Prusa I3 Rework, Ramps 1.4, Marlin, Pronterface, Tinkercad.
Plan B is always to be somebody else.

Looks like a normal screw fit?

That is a std Pneumatic Pushfit connector They come in various sizes and threads the ones we are interested in are for 4mm Dia tube (1.75 mm filament) and 6mm tube (3 mm filament) the common thread sizes are M5,M6 and 1/8th BSPP You can get them from various suppliers and EBAY is usually full of them you just need to get one that is the right three for your COLD END Body

Doug

Yep. I installed an R/O water filtering system and used the nylon versions of these.
I just have to design a Thingy interface to house the female part then put that thingy on the extruder thingy.
I am overthinged.

Quote
Giantkiller
Yep. I installed an R/O water filtering system and used the nylon versions of these.
I just have to design a Thingy interface to house the female part then put that thingy on the extruder thingy.
I am overthinged.

Did you see that I replied to your Design post Found a dual E3D Holder for you?

Yep. I installed an R/O water filtering system and used the nylon versions of these.
I just have to design a Thingy interface to house the female part then put that thingy on the extruder thingy.
I am overthinged.

Quote
Giantkiller
Yep. I installed an R/O water filtering system and used the nylon versions of these.
I just have to design a Thingy interface to house the female part then put that thingy on the extruder thingy.
I am overthinged.

No I meant your 3d Design topic?

Oh yeah. I pulled that down and am working my interation right now.

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Giantkiller
Oh yeah. I pulled that down and am working my interation right now.

The dual e3d mount one?

This one dual E3D for I3

Edited 1 time(s). Last edit at 01/19/2016 01:31PM by dougal1957.

Yep. I will post when I find out what works with the x stop mount I have in tinkercad. I have to use the Replikeo one because it matches the x axis bearing mount.

Getting back on topic, I would like to know why some of those things allow the tube to go through them and others stop it inside? I bought some cheap Chinese ones and they won't allow the tube to pass through, but my hotend came with one that does. Is that a matter of choosing a right thread diameter (like there needs to be a certain difference between that and the tubes diameter), some other type of fitting, or manual modification?

I hope this is on track. The pressure fitting enables the tube to slide without deforming the inside diameter of the tube. There are reprap instructions to use a 2mm drill bit to ream the tube once it has been screwed on the initial fitting. I believe part of your concern deals with part of this issue in this way.
We all know variations appear in products due to a previous mechanical failure point.

Edited 1 time(s). Last edit at 01/19/2016 09:21PM by Giantkiller.

Quote
Giantkiller
I hope this is on track. The pressure fitting enables the tube to slide without deforming the inside diameter of the tube. There are reprap instructions to use a 2mm drill bit to ream the tube once it has been screwed on the initial fitting. I believe part of your concern deals with part of this issue in this way.
We all know variations appear in products due to a previous mechanical failure point.

I think what he means is that on some of the fittings the internal bore is at least 4mm all the way thru so you can pass the PTFE tube all the way thru the fitting which is a good idea and I drill all mine out at the back to allow this to happen, Minimum thread size to do this is M6. The riprap instructions are for there own design which is not the same as these push fit fittings at all.

Quote
dougal1957

I think what he means is that on some of the fittings the internal bore is at least 4mm all the way thru so you can pass the PTFE tube all the way thru the fitting which is a good idea and I drill all mine out at the back to allow this to happen, Minimum thread size to do this is M6. The riprap instructions are for there own design which is not the same as these push fit fittings at all.

Yeah, this is what I was trying to say... So, it needs a bit of drilling out then. Thanks.

I've drilled out my M6 push fitting to allow the tube to go all the way through.

Take it slowly, it's brass so your drill bit might grab. Also really try to get it straight, there isn't a lot of meat between the hole and the inside of the thread.

Blow it out well once you've done it so that metal fragments don't get down into the hotend.


I like having the tube go through the fitting so that it can get right up close to the extruder drive gear.

Distech Automation sells a connector that passes the PTFE tubing all the way through. There is no need to drill or ream the PTFE tubing afterwards. While you're there pick up a Prometheus hot end


p.s. Just a satisfied user, no other connection.

After converting to Bowden I finally scrapped it because the tube kept pulling out at the extruder. Sizes were correct, just wouldn't grab the tube tight enough.