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



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Leo, who was elected on May 8, said Thursday that Jesus Christ is “our peace” because he “shows us the way to overcome conflicts, whether interpersonal or international. With his grace, we can and must each day our part to reject hatred, violence and opposition, and to practice dialogue, peace and reconciliation.”
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The pontiff began by asking for “justice, peace and stability” for Lebanon, the Palestinian territories, Israel and Syria. Later, he said that, by becoming man, “Jesus took upon himself our fragility,” allowing him to identify “with those who have nothing left and have lost everything, like the inhabitants of Gaza.”
Leo celebrates Christmas Holy Mass at the Vatican.
Leo celebrates Christmas Holy Mass at the Vatican. Yara Nardi/Reuters
Leo holds an incent burner at St Peter's Basilica.
Leo holds an incent burner at St Peter's Basilica. Tiziana Fabi/AFP/Getty Images
The pope’s first Christmas since his election took place in wet and cold conditions, but that failed to deter large crowds from coming out to hear his message.
Earlier during Mass, he asked how, at Christmas, “can we not think of the tents in Gaza, exposed for weeks to rain, wind and cold.” With more than 400,000 homes destroyed during Israel’s war against Hamas, Gazans are being forced to choose this winter between living in tents exposed to the elements or living inside buildings that could collapse any minute.
“Fragile is the flesh of defenseless populations, tried by so many wars, ongoing or concluded, leaving behind rubble and open wounds,” Leo said. He quoted an Israeli poet, Yehuda Amichai, who called for peace to blossom “like wildflowers.”
Related article
The acting Latin Patriarch of Jerusalem Pierbattista Pizzaballa attends a morning Mass at Saint Catherine's Church, in the Church of the Nativity, in Bethlehem, in the Israeli-occupied West Bank December 25, 2025. REUTERS/Mussa Qawasma
Christmas celebrated once again in Bethlehem but West Bank suffering persists
Later during his Christmas message, he called for compassion towards those “who are fleeing their homeland to seek a future elsewhere, like the many refugees and migrants who cross the Mediterranean or traverse the American continent.” He offered Christmas greetings in different languages including Italian, English, Arabic, Chinese, Polish.
Since his election, Leo has highlighted the plight of those suffering of those in Gaza, and has been outspoken by calling for the better treatment of migrants. In his first major interview in September, the American pope voiced concern over “some things” happening in the country of his birth, highlighting the significance of a letter his predecessor, Pope Francis, had sent to US bishops earlier this year, rebuking the administration’s deportation plans.
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Pope Leo XIV celebrated the first Christmas since his election by denouncing the suffering of people of Gaza – taking shelter in tents from the “rain, wind and cold” – and by calling for the guns to fall silent in Ukraine.
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On Christmas Day, the first US-born pope, offered the traditional “Urbi et Orbi” blessing (“To the City and to the World”) from the balcony of St Peter’s, surveying a world speckled with conflicts from Yemen to Myanmar, and calling for compassion towards those who have fled their homelands to seek a future in Europe and America.
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Leo, who was elected on May 8, said Thursday that Jesus Christ is “our peace” because he “shows us the way to overcome conflicts, whether interpersonal or international. With his grace, we can and must each day our part to reject hatred, violence and opposition, and to practice dialogue, peace and reconciliation.”
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The pontiff began by asking for “justice, peace and stability” for Lebanon, the Palestinian territories, Israel and Syria. Later, he said that, by becoming man, “Jesus took upon himself our fragility,” allowing him to identify “with those who have nothing left and have lost everything, like the inhabitants of Gaza.”
Leo celebrates Christmas Holy Mass at the Vatican.
Leo celebrates Christmas Holy Mass at the Vatican. Yara Nardi/Reuters
Leo holds an incent burner at St Peter's Basilica.
Leo holds an incent burner at St Peter's Basilica. Tiziana Fabi/AFP/Getty Images
The pope’s first Christmas since his election took place in wet and cold conditions, but that failed to deter large crowds from coming out to hear his message.
Earlier during Mass, he asked how, at Christmas, “can we not think of the tents in Gaza, exposed for weeks to rain, wind and cold.” With more than 400,000 homes destroyed during Israel’s war against Hamas, Gazans are being forced to choose this winter between living in tents exposed to the elements or living inside buildings that could collapse any minute.
“Fragile is the flesh of defenseless populations, tried by so many wars, ongoing or concluded, leaving behind rubble and open wounds,” Leo said. He quoted an Israeli poet, Yehuda Amichai, who called for peace to blossom “like wildflowers.”
Related article
The acting Latin Patriarch of Jerusalem Pierbattista Pizzaballa attends a morning Mass at Saint Catherine's Church, in the Church of the Nativity, in Bethlehem, in the Israeli-occupied West Bank December 25, 2025. REUTERS/Mussa Qawasma
Christmas celebrated once again in Bethlehem but West Bank suffering persists
Later during his Christmas message, he called for compassion towards those “who are fleeing their homeland to seek a future elsewhere, like the many refugees and migrants who cross the Mediterranean or traverse the American continent.” He offered Christmas greetings in different languages including Italian, English, Arabic, Chinese, Polish.
Since his election, Leo has highlighted the plight of those suffering of those in Gaza, and has been outspoken by calling for the better treatment of migrants. In his first major interview in September, the American pope voiced concern over “some things” happening in the country of his birth, highlighting the significance of a letter his predecessor, Pope Francis, had sent to US bishops earlier this year, rebuking the administration’s deportation plans.
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Pope Leo XIV celebrated the first Christmas since his election by denouncing the suffering of people of Gaza – taking shelter in tents from the “rain, wind and cold” – and by calling for the guns to fall silent in Ukraine.
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On Christmas Day, the first US-born pope, offered the traditional “Urbi et Orbi” blessing (“To the City and to the World”) from the balcony of St Peter’s, surveying a world speckled with conflicts from Yemen to Myanmar, and calling for compassion towards those who have fled their homelands to seek a future in Europe and America.
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Leo, who was elected on May 8, said Thursday that Jesus Christ is “our peace” because he “shows us the way to overcome conflicts, whether interpersonal or international. With his grace, we can and must each day our part to reject hatred, violence and opposition, and to practice dialogue, peace and reconciliation.”
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The pontiff began by asking for “justice, peace and stability” for Lebanon, the Palestinian territories, Israel and Syria. Later, he said that, by becoming man, “Jesus took upon himself our fragility,” allowing him to identify “with those who have nothing left and have lost everything, like the inhabitants of Gaza.”
Leo celebrates Christmas Holy Mass at the Vatican.
Leo celebrates Christmas Holy Mass at the Vatican. Yara Nardi/Reuters
Leo holds an incent burner at St Peter's Basilica.
Leo holds an incent burner at St Peter's Basilica. Tiziana Fabi/AFP/Getty Images
The pope’s first Christmas since his election took place in wet and cold conditions, but that failed to deter large crowds from coming out to hear his message.
Earlier during Mass, he asked how, at Christmas, “can we not think of the tents in Gaza, exposed for weeks to rain, wind and cold.” With more than 400,000 homes destroyed during Israel’s war against Hamas, Gazans are being forced to choose this winter between living in tents exposed to the elements or living inside buildings that could collapse any minute.
“Fragile is the flesh of defenseless populations, tried by so many wars, ongoing or concluded, leaving behind rubble and open wounds,” Leo said. He quoted an Israeli poet, Yehuda Amichai, who called for peace to blossom “like wildflowers.”
Related article
The acting Latin Patriarch of Jerusalem Pierbattista Pizzaballa attends a morning Mass at Saint Catherine's Church, in the Church of the Nativity, in Bethlehem, in the Israeli-occupied West Bank December 25, 2025. REUTERS/Mussa Qawasma
Christmas celebrated once again in Bethlehem but West Bank suffering persists
Later during his Christmas message, he called for compassion towards those “who are fleeing their homeland to seek a future elsewhere, like the many refugees and migrants who cross the Mediterranean or traverse the American continent.” He offered Christmas greetings in different languages including Italian, English, Arabic, Chinese, Polish.
Since his election, Leo has highlighted the plight of those suffering of those in Gaza, and has been outspoken by calling for the better treatment of migrants. In his first major interview in September, the American pope voiced concern over “some things” happening in the country of his birth, highlighting the significance of a letter his predecessor, Pope Francis, had sent to US bishops earlier this year, rebuking the administration’s deportation plans.
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