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Do you splice your filament


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I am starting to print projects that require more than 500G of filament.  So I have some spools with approx 400g of filament left.

I want to try to splice these partial rolls, but not sure  how difficult it would be to rewind the added filament back onto the spool.

Looking for input on how members are doing it?

Should I pause a print to splice on more filament, or just combine the rolls before I start a print?

Edited by DanPin
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I can't speak to splicing filament, but I've got filament runout sensors on my printers and they are very nice for this use case. I do get a small section of leftover filament, but only the length of the reverse bowden tube. You can even make filament runout sensors with a spare switch and printed parts.

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I haven't, I've considered it because I have too many rolls with ~5ft left that usually isn't worth loading for me. On my ender I've just shoved more in to follow the scrap up, and added the pause/resume addon to octoprint after that.


This is maybe where I'll get to someday:


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  • DanPin changed the title to Do you splice your filament
  • 4 weeks later...

I have used the cheap irons that have the channels, that look like pliers. Similar to the video, but teflon plates that get heated. So heat applied to tube, push to fuse. They work fairly well. I'm thinking they take a lot of practice before being excellent, though. If there is any lateral movement of the joint, on mine, and it will snap. But I was using some old filament. Another spool I did printed better, through an AMS, so practice.

I mentioned this elsewhere a long time ago, but in a past life I was a fiber splicer (well, POTS and CCTV, as well as any comms 'wire'), and we used fusion splicers all the time. There were, and I suppose still are, manual and automatic. Place material to fuse in holder after preparation. Flip cover over splicing 'pit'. Press 'fuse' button. Depending on manual or auto, jog two dials to 'press' the ends together causing a fused splice by applying a high voltage arc, over a predetermined duration. Automatic would do all the previous for you.

If I had the motivation I'd iterate to a solution similar.

Here is some information about what I'm talking about if you are interested in that sort of stuff: https://www.fusionsplicer.fujikura.com/

I am intimately familiar with almost every product on their site. Man, I miss that life some times. But only some. I don't miss bits of fiber stuck in my thigh.

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