Filament Splicer Joiner By TrustFm

by trustfm Aug 20, 2015
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Great idea! I want to try it!

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Once the filament is joined how to you get the PTFE tube off the filament? Do you have to slide it all the way to the end?

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will the soldering iron introduce residue iron into the filament causing cloggs?

Instead of using the hot end, use the heating block instead. The heating block is usually clean. Whereas, one has to clean the hot end with foam.

Or perhaps, just use the extruder i.e. heat it to 190C.

Against expectations it works astonishling well. Thumbs up

fsck 1234 said it best...simple, yet elegant. Bravo from me, too! It only takes a couple of tries to get the proper technique. Thanks!!

What a clever idea. Simple yet so elegant. Bravo. This will be used this weekend. I hope. :)

Used it to splice some scraps of PETG together.
After some practice it works great. Thank you!

Thanks for your support ! Have a nice day

Thanks for including the design file that's a great thing to do...

I am looking forward to using this design. Thanks for posting it. I have a question while I wait for the screws, nuts and PTFE tubing to arrive. With regard to the PTFE tube, does the M3 set screw on that side go through a hole drilled in the side of the tubing so the screw can bear on the 'old' filament? Or, does the screw apply its squeeze on the outside of the PTFE tubing, effectively squashing it a bit so that the filament is squeezed a bit? Thanks for the help.

The top M3 screw is partially optional just squeeze a little bit the ptfe tube.
The bottom one is the crucial .
This tool works fine but you have to understand how it works. The top parts should move under force (so if it too loose the top filament you adjust the top screw) the bottom one is fixed.

TIP: Do not overheat the filament and use only the edge of the iron on both ends. In order to acchieve that the handle may be pressed a little bit since top-iron-bottom filament ate touching.
Once you see it heat up move the handle away from the iron tip and close it fast and firmly

how do you get rid of the excess material around the joint? this way the bulging joint will jam a bowden tube

using the PTFE tube and closing fast the joiner you wont have problems .
You do not have to overheat the filament.
Also notice that the join has a trend . In the example the blue filament is first and then the black.
If you try to add in your bowden tube the black filament and then the blue will jam

I really like the your design! Would it be possible for you to create a version for 3mm/2.85mm filament?

I do not use 3mm filaments so i can not design untested models.
Also i do not have PTFE for 3mm filaments.
I use only PLA the device is not tested at ABS either.
The FreeCAD file is provided so you can modify it.