So heres a picture of the thing i just posted.
So easy 
A little video review to see those puppies in action?
How strong is the bond. Enough to last extruder pull?
@Jean-Francois_Talbot yes maybe ill do a video thx for the idea. Well PETG apperently as strong as the material itself. On ABS you have to check it. I pull out the filament with the excessmaterial on it to shear of the excess. If that holds its fine. I have no idea on PLA but when I welded PLA together by hand it was the easiest so i suspect it to hold.
Yeah interested in seeing a video as well. Those 2 items are designed to fuse filament I’m guessing? Where did you get them?
@Shai_Schechter I postet a link earlier in 3D Printing but google+ just showed ebay 
so i postet this
Ah I see. Yeah… english would be nice 
But definitely curious to see how this works.
Yeah sry its a german dealer who I believe makes them himself
Looks like it is for 3mm filament only: I offer here a filament connector for 3mm filament.
With these connectors it can weld Filamentreste or multicolored filaments with a diameter of 3 mm safely without displacement or bump together. As seen on the photos, I once welded some Differently colored filaments together. So man can you generate various efects with 3D objects. With the connector can each filament welding which is suitable for 3D printer.
The connector is made of titanium, which is almost indestructible.
Gebrausanweisung: they insert the two filament ends by the connectors and let them dominate ausschauen about 2mm ends. then heating it ends with a small flame until they start to burn. then pressing them both the connectors around 10 seconds that together. Then they press the connector again firmly and twist it the connector case against each other, while the Scheißwulz is truncated. If all goes well, you can pull out of the filament connector now.
Have fun shopping.
What did shipping to the US run? The seller doesn’t list it as an option, at least on the 1.75mm version.
How do these work? Where’s the power source? I thought I saw a previous discussion and that there’s something that then cleans the seam too.
Contacted the ebay seller, they dont ship to Canada 
@Samer_Najia That is what I was wondering - if it heats it or what. I don’t see any power source either. Seems to be some sort of manual friction mechanism maybe? A video is needed!
@Shai_Schechter naaw you light it with a lighter or a torch. Or you just heat it enough then you press it together. Theres a sharp cone which cuts of the seam.
Hmm I don’t know if using a lighter or a torch is a very efficient method, but I like this concept.
A battery driven coil, a heatgun or even a soldering iron would be my preference
@Samer_Najia yes you can use an iron of course. Heatgun nahh you need to touch the two metalparts, not good
@Samer_Najia how about use your hotend? ^^
I think the hot end would be impractical, but the soldering iron might be viable
There is a french made gizmo that does the same thing, but its a bit expensive