Joining 3D filament ?

Joining 3D filament ?

This topic has 4 replies, 5 voices, and was last updated 8 August 2024 at 18:12 by Peter Greene.

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8 August 2024 at 15:44 #745942
John Doe 2
Participant
@johndoe2
Sometimes when printing, we come to the end of a filament reel and need to feed a new reel in, mid way through a print.

Normally I just feed the new filament into the extruder motor port while the printer is printing and this works, but until the new filament is completely through all the way to the nozzle, any filament retractions cannot work – all that happens is that the new filament retracts inside the Bowden tube but obviously doesn’t pull the last piece of the old filament back.

Can anyone suggest a way of successfully joining filament ? I have tried various plastic glues and hot-gun glue, but none seem to work.
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8 August 2024 at 15:56 #745943
Peter Cook 6
Participant
@petercook6
You could heat the ends of both filaments sufficient to melt them, press together and then clean up the joint before resuming printing. However I doubt that you would be successful.

Far more successful would be to pause the print, remove the remaining bit of the old filament, insert the new filament, purge and resume printing. Most printers will have the facility in the user interface to do this – many people do it to change colours during printing.
8 August 2024 at 16:00 #745944
Fulmen
Participant
@fulmen
Is that really a problem? As long as the feed pressure is released the material extrusion should stop as well. As for joining filament the simplest and safest option is to melt them together. here are some ideas:

How to Join, Fuse or Splice Filament Together
8 August 2024 at 17:35 #745964
Steve F
Participant
@stevef
There a quite a lot of filament joiner tools around. They just hold the filaments to be jointed in the correct position. You heat the ends to join them. The tool can the be opened to get the filament out.

There a few ideas on thingiverse. Useful for people who make filament from plastic bottles. Search for “petamentor” if interested. There are other projects also with their own ideas.

regards

Steve
8 August 2024 at 18:12 #745971
Peter Greene
Participant
@petergreene36336
Quite a few on Amazon under < filament joiner >.
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