Filament Splicer

Project cancelled, click here to read why
The idea for Filament Splicer was born about a month after our Ultimaker 3D Printer was build. As cool as 3D Printing is, printing in one color is boring.

Users of normal, single head FFF/FDM printers are stuck with single color unless they join filament pieces together to produce one multi-colored string. It is not very complicated but process is quite awkward and you will get fed up very quickly.

If you want to have proper, stable filament join you need to have right temperature on the tip of plastic when you connect pieces together. This is hard to achieve when you use some arbitrary heat source. You either underheat or overheat and burn the plastic. Using print head of your printer is best 'ad-hoc' solution but it leaves quite a mess on it, you cannot print when you splice and plastic which is in the head slowly gets burned while you take time to splice your string.

Then, of course there is issue with forming of the joint, carpet knife and fingers where our favorite tools for that job but it took quite a long time to form each joint.

We have had our share of failed prints due to broken joints / stuck filament and finally decided to create a device which will help to splice filament. Initial idea was to create fully automated unit: you place filament ends on copper block, close it, push the button and viola - you have your joint. That was the theory.... In practice this is impossible because PLA and ABS expand during heat-up and contract during cool down, this results in either no joint at all or bubble-filled mess.

Many headache filled days [Even best PLA is really nasty stuff when you breath it in for a while] later we dropped the idea and went for 'open' model with precisely manufactured grooves which help to quickly heat up, connect and form joints.

Thermal insulation was another challenge, we wanted to allow up to 260c temperature but nothing could properly insulate enclosure from hot copper block for prolonged period of time. Ceramic fiber thermal tape can take that heat but one needs a lot of it and then there is itching... Chinese tape is horrible and even best branded, made in USA [ThermoTec] tape is not flawless. We eventually gave up on ceramic fibre and went with PFTA [Teflon] plates. Since PFTA can be outright poisonous at high temperatures, we decided to use high quality - made in Europe material - this way we are sure that maximum temperature of 235c is well within safety limit.

Availability

Filament splicer can be pre-ordered via our campaign on Indiegogo, it is available as a DIY kit or fully assembled unit.

 

Assembled
Assembled
Kit
Kit

 

Open Source

Filament splicer blueprints are released under Creative Commons Attribution-NonCommercial 4.0 International License and can be downloaded from Thingiverse and Youmagine.

Tags: 
projects
filament splicer

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But the security guarantees? That’s where far more challenging ideas, like credibility, come into play. Could Zelensky rely on the US to deliver on some NATO Article 5-type promise, to defend Ukraine if Russia breaches any peace agreement?

Putin himself might even see an opportunity to further weaken the West, by testing any such guarantees, confident they are a bluff he could call. But all that would be for the future.

For now, it looks like Zelensky will have to weigh up whether he could bring his country with him if he were to cede territory to Russia – some of it still in Ukrainian hands – or whether he and his people could bear the costs of potentially defying Trump a Nobel Peace Prize, and say no.

If he chose the latter, would the US President immediately end all remaining American support for Ukraine, in terms of military aid and intelligence sharing, for instance?

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The land side of that “deal” will be obvious. It can be drawn on a map. Crimea: gone, says Trump. Donetsk: give all of it up, says Putin, apparently with Trump’s blessing.

But the security guarantees? That’s where far more challenging ideas, like credibility, come into play. Could Zelensky rely on the US to deliver on some NATO Article 5-type promise, to defend Ukraine if Russia breaches any peace agreement?

Putin himself might even see an opportunity to further weaken the West, by testing any such guarantees, confident they are a bluff he could call. But all that would be for the future.

For now, it looks like Zelensky will have to weigh up whether he could bring his country with him if he were to cede territory to Russia – some of it still in Ukrainian hands – or whether he and his people could bear the costs of potentially defying Trump a Nobel Peace Prize, and say no.

If he chose the latter, would the US President immediately end all remaining American support for Ukraine, in terms of military aid and intelligence sharing, for instance?

If that happened, to what extent could Zelensky’s European allies really step in and fill in the gaps left by any full US retreat?

It is an almost impossibly hard choice before him.
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