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Concept Laser Metal AM Technology Used for Archeological Preservation of Celtic Artifact

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3D printing the cultural history of humanity? Absolutely. 3D production methods are breaking new ground all the time. The unwritten motto of 3D experts seems to be the desire to continually test the limits of the technology. 3D printing is even opening up totally new possibilities for documenting and copying artifacts in the field of archeological preservation. The latest example is a replica of the figure of a bronze horse rider from an early Celtic chieftain’s grave near Unlingen, Germany in the Biberach region of Baden-Württemberg. Using one of its Mlab cusings, Concept Laser has produced a faithful copy of this prehistoric rider. An object nearly 2,800 years old is being printed out of powder.

3D metal printing is making it possible to utilize archeological discoveries in new ways. By creating a faithful replica, original objects can be evaluated scientifically and replicas made available for exhibitions at the same time. Cultural history is taking shape in 3D printers. Holding the Rider of Unlingen in your hand lets you look back at 28 centuries of cultural history.

Scientific implications of the “Rider of Unlingen”

The Rider of Unlingen is a burial object found in a Celtic chieftain’s grave from the Hallstatt culture. This bronze statuette of a rider on a double horse was located in a wagon grave in Unlingen, Germany which had already been robbed in ancient times. The broken edges of the incomplete legs of the horse indicate that the statuette was originally mounted to another object which is no longer preserved. This could have been the top of a bronze lid, the base of a larger bronze vessel or furniture, a wagon or a yoke. The other burial objects date the figurine to the 8th or 7th Century B.C.E. Figurative depictions from this time period are extremely rare in southern Germany. The Rider of Unlingen represents one of the oldest depictions of a horse rider north of the Alps. This figurine is a unique early Celtic piece in Central Europe.

The “Rider of Unlingen” 3D project

The transition from molding to additive manufacturing opens up new prospects for scientific evaluation in the field of archeology, as well as the exhibition of objects in several different places at the same time. Until just a few years ago, discoveries could only be reproduced through direct molding, a process which always risks damaging the original. Through the use of additive 3D technology, it is now possible to produce copies without contacting the original at all. To digitize the “Rider of Unlingen” object from the Hallstatt culture, a specialized process known as x-ray computer tomography (CT) was used. The bronze horse rider was x-rayed three dimensionally and evaluated using the “VG Studio Max 3.0” software from Volume Graphics. The STL data obtained through this process makes it possible to transfer the industrial 3D printing process of today over to applications in the field of archeology.

In the meantime, the technical progress being made in terms of material variety and printing precision is enormous. For the 3D printing job, Concept Laser provided the Baden-Württemberg State Office for the Preservation of Monuments with its LaserCUSING technology in the form of an Mlab cusing. Concept Laser’s material engineers also found a bronze alloy similar to the original: a modern copper-tin alloy with a density and specific weight approximating those of the artifact from the 8th/7th Century B.C.E. The precise percentages of copper and tin could still be determined using x-ray fluorescence analysis. This is how the “Rider of Unlingen” was printed in bronze true to the original. Visually and tactilely, the reproduction horse rider is on par with the original piece.

Outlook for 3D Printing in Archeology

The additive manufacturing of faithful replicas through 3D printing is opening up new prospects for the field of archeology, making discovered metal objects available for scientific purposes. At the same time, copies can be exhibited to museum visitors. Essentially, multiple copies of historical discoveries can be printed out and used, where only experts would be able to tell the difference through material analysis, as the production process uses powder of modern origin. Even the issue of re-engineering isn’t taboo – theoretically, it should even be possible to reconstruct heavily damaged objects in the future. These objects would then have the same shape as the original production, enabling the destructive traces of history on them to be erased. Artifacts from humanity’s past give us a glimpse of our cultural history, and 3D printing makes it possible to experience this history in a tangible way.

Implications of AM for archeological artifacts and discoveries

Archeological discoveries with delicate and complex structures can be reproduced highly accurately The 3D printing process enables the contact-less reproduction of artifacts without damaging them. Replicas are absolutely accurate in every detail and faithful to the original; they can be made accessible to museums while the originals remain in archives for research purposes. 3Metal D printed replicas have high density, comparable feel and high surface quality. Considerably shortened development time and expense for mold-less replicas of unique objects
No tools to buy, less waste, as well as the oossibility of re-engineering in the case of broken objects.

Nicole Ebinger-Rist of the Baden-Württemberg State Office for the Preservation of Monuments on the regional board of Stuttgart, Germany explained just what motivates a conservator to get involved with 3D printing.

What implications does 3D printing have for the future of exhibitions in practice?
Nicole Ebinger-Rist: The replica created is being shown as part of the exhibition entitled “The Rider of Unlingen” – Celts, horses and charioteers. It’s a exhibition at two museums showing what state-of-the-art technology can do today. True-to-detail reproduction without direct molding (which could potentially damage discovered objects) is crucial here. In the museum world, original specimens are grouped together in exhibitions, allowing them to be contrasted with comparable objects. These comparative collections give exhibition visitors and scientific researchers insight in a historical context. A replica which is faithful to the original can be made accessible at museums in many different places around the world. Theoretically, it should even be possible to reconstruct heavily damaged objects in the future, which would give the object its original shape back. Essentially, we’d be able to erase the destructive traces of history from an object.

What form does cooperation between partners of the 3D project take?
Nicole Ebinger-Rist: Volume Graphics in Heidelberg, Germany suggested the idea of using 3D metal printing to produce replicas. In a CT scanner, we were able to capture the shape of the “Rider of Unlingen” as STL data without touching or damaging it. We printed out the horse rider using the LaserCUSING process on a machine from Concept Laser. Concept Laser also lent us their material expertise. The historical rider is made of a copper alloy from the Iron Age, and we did not want to remove any material for a precise analysis. The 3D metal printing experts found a copper alloy for us which comes very close to the original in terms of specific weight and density distribution. It was an exciting journey for all of us.

How convincing is the appearance of a replica like this?
Nicole Ebinger-Rist: I was very surprised by the level of detail. All of a sudden, you’re holding an object from the 7th Century B.C.E. in your hands, except that it’s made out of powder from the 21st Century. You’ve got a cultural-historically relevant copy in your hands and are looking at 28 centuries gone by. It’s simply overwhelming. 3D printing is a wild technology. Every archeological find has it’s own magic, especially when they are as unique as the “Rider of Unlingen.” When you’re holding a reproduction which resembles the original one-to-one, it’s a very special thing, and very important for further research. Whole new possibilities are being opened up to curators, conservators and scientists.

About the Baden-Württemberg State Office for the Preservation of Monuments and Nicole Ebinger-Rist

In addition to capturing and documenting cultural monuments, research is a key part of monument preservation in Baden-Württemberg. This research includes inventory taking, excavation and evaluation activities and a variety of different projects and research programs. Some of these projects are financed by third-party funds, such as the German Research Foundation (DFG) and the German Federal Ministry of Education and Research (BMBF). Others arise from day-to-day monument preservation work. Various different departments and specialists from the state office work together here.

Nicole Ebinger-Rist heads up the archeological restoration department at the State Office for the Preservation of Monuments on the Stuttgart regional board and is accompanying the Rider of Unlingen discovery from the Hallstatt culture as the conservator. She is currently writing her thesis on an early Celtic princess’ grave which was discovered on the Danube plain in Upper Swabia in 2010 and which has been exposed and analyzed under laboratory conditions over the past few years.

Background information on the Hallstatt culture and the “Rider of Unlingen”

The ancient pre-Roman period of the Iron Age across much of Europe from about 800 to 450 B.C.E. is designated the period of the Hallstatt culture. The “Rider of Unlingen” is a burial object found in a chieftain’s grave. The Celtic nobility of the Hallstatt culture was buried in complex barrow graves. These graves featured high-value burial objects to indicate the importance of the person who died. These graves were secured, but frequently robbed of their precious treasures by grave robbers.

This was also the case with the grave site in Unlingen. Presumably, the “Rider of Unlingen” was “forgotten” during an ancient grave robbery, enabling archeologists to preserve it for posterity.

The horse rider statuette was located in a central grave of Barrow 3 in Unlingen which had been robbed. The most outstanding discovery of the excavation was from the Hallstatt culture (Ha C – 8th/7th Century). This piece is a bronze statuette of a horse rider on a double horse which was originally mounted to another object. This could have been the top of a bronze lid or the base of a larger bronze vessel, for example. The object illustrates the high level of craftsmanship of the period with regard to the use and processing of metallic alloys.

The discovery and excavation of the well-preserved Celtic graves near Unlingen in the summer of 2016 made a big stir thanks to the extraordinary burial objects found there. One of the discoveries, the “Rider of Unlingen” (a bronze sculpture from 700 B.C.E.) is the oldest figurative depiction of a rider found in Germany.

This impressive original discovery, along with other original pieces from the burial ground near Unlingen, were shown at the Heuneburg Museum in the Hundersingen section of Herberting for the first time at the special exhibition on Celts, horses and charioteers  which started on May 14, 2017 and will continue through November 5, 2017.



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