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

77593 Comments

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DanielKig (not verified)

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Fri, 11/21/2025 - 22:53

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Fri, 11/21/2025 - 23:48

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RobertRooge (not verified)

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The Democratic wins by candidates with sharp ideological differences will do little to settle the party’s long-raging internal debate about its way forward, with a host of competitive midterm primaries just months away and the 2028 presidential primary already looming.

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“It’s not just a message about Democrats; it’s a message about our entire country. I think Americans are appalled by what they are seeing coming out of this administration,” New York Rep. Alexandria Ocasio-Cortez said on CNN from Mamdani’s victory party.

In California, voters approved by a wide margin a redistricting ballot measure intended to boost Democrats’ chances in next year’s battle for control of the House. And in Pennsylvania, Democratic state Supreme Court justices won their retention votes, allowing Democrats to keep their majority on the high court in a perennial battleground state where legal challenges over voting rules are all but certain.
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But their campaigns had some things in common. Though their solutions were different, the candidates focused on the issue of affordability. And they were all fiercely critical of Trump’s performance.

“It’s not just a message about Democrats; it’s a message about our entire country. I think Americans are appalled by what they are seeing coming out of this administration,” New York Rep. Alexandria Ocasio-Cortez said on CNN from Mamdani’s victory party.

In California, voters approved by a wide margin a redistricting ballot measure intended to boost Democrats’ chances in next year’s battle for control of the House. And in Pennsylvania, Democratic state Supreme Court justices won their retention votes, allowing Democrats to keep their majority on the high court in a perennial battleground state where legal challenges over voting rules are all but certain.
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EdwinLut (not verified)

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Sat, 11/22/2025 - 00:12

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In Virginia, moderate former Rep. Abigail Spanberger turned in the strongest Democratic performance in the state’s recent history as she coasted to victory. And in New Jersey, another moderate, Rep. Mikie Sherrill, busted apart the coalition Trump and her Republican rival, former state lawmaker Jack Ciattarelli, had put together to close the Garden State’s gap in recent elections.
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The Democratic wins by candidates with sharp ideological differences will do little to settle the party’s long-raging internal debate about its way forward, with a host of competitive midterm primaries just months away and the 2028 presidential primary already looming.

But their campaigns had some things in common. Though their solutions were different, the candidates focused on the issue of affordability. And they were all fiercely critical of Trump’s performance.

“It’s not just a message about Democrats; it’s a message about our entire country. I think Americans are appalled by what they are seeing coming out of this administration,” New York Rep. Alexandria Ocasio-Cortez said on CNN from Mamdani’s victory party.

In California, voters approved by a wide margin a redistricting ballot measure intended to boost Democrats’ chances in next year’s battle for control of the House. And in Pennsylvania, Democratic state Supreme Court justices won their retention votes, allowing Democrats to keep their majority on the high court in a perennial battleground state where legal challenges over voting rules are all but certain.
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DouglasFip (not verified)

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Sat, 11/22/2025 - 00:28

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In Virginia, moderate former Rep. Abigail Spanberger turned in the strongest Democratic performance in the state’s recent history as she coasted to victory. And in New Jersey, another moderate, Rep. Mikie Sherrill, busted apart the coalition Trump and her Republican rival, former state lawmaker Jack Ciattarelli, had put together to close the Garden State’s gap in recent elections.
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In New York City, democratic socialist Zohran Mamdani’s win marked the second time this year he’d defeated former Gov. Andrew Cuomo — first in the Democratic primary, and then in the general election, with Cuomo running as an independent backed by Trump.
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The Democratic wins by candidates with sharp ideological differences will do little to settle the party’s long-raging internal debate about its way forward, with a host of competitive midterm primaries just months away and the 2028 presidential primary already looming.

But their campaigns had some things in common. Though their solutions were different, the candidates focused on the issue of affordability. And they were all fiercely critical of Trump’s performance.

“It’s not just a message about Democrats; it’s a message about our entire country. I think Americans are appalled by what they are seeing coming out of this administration,” New York Rep. Alexandria Ocasio-Cortez said on CNN from Mamdani’s victory party.

In California, voters approved by a wide margin a redistricting ballot measure intended to boost Democrats’ chances in next year’s battle for control of the House. And in Pennsylvania, Democratic state Supreme Court justices won their retention votes, allowing Democrats to keep their majority on the high court in a perennial battleground state where legal challenges over voting rules are all but certain.
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RobertRooge (not verified)

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Sat, 11/22/2025 - 00:54

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<a href=https:/... (not verified)

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Sat, 11/22/2025 - 01:43

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Sat, 11/22/2025 - 01:49

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Kevintoupe (not verified)

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Sat, 11/22/2025 - 01:57

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