Not sure that the proposal delights the defenders of the heritage. A Dutch company, Concr3De, has proposed to reconstruct the missing parts of Notre-Dame thanks to 3D printers. Much faster and less expensive than the size of stones, this solution would help to meet the deadline of 5 years, as desired by the president and Emmanuel Macron to the complete restitution of the cathedral of paris.

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And unlike many of the techniques discussed to rebuild in such a short time, the technology of 3D printer is intended to be very respectful of the cathedral’s original. “We believe that reuse old materials that we would keep one part of the soul of the building”, explains in Figaro Eric Geboers, co-founder of Concr3De.

Stryge, printed in 3D by Conc3De CONCR3DE

The company provides for the effect of reuse of the ash collected on the scene of the fire, and make them live a second life to items lost to Notre Dame. “Show the ashes could make the fire a new chapter in the history of” the cathedral, ” according to Eric Geboers. “Use the most modern technologies that would make justice to hundreds of years of technological developments in architecture”, complete it.

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Concr3De plans to use a technology called “jet glue”. It is the mixture of a fine powder – here the ash and the crushed limestone – and-ink, as well as inorganic compounds. Eric Geboers is the final material will contain “no plastic, glue or resin.”

The powder used to 3D print. CONCR3DE

To prove the reliability of this technology, the company has completed a printing of the Stryge, one of the most famous gargoyles of Notre-Dame created by Viollet-le-Duc, from a 3D modeling. Evidence of the speed and the fidelity of the implementation. A statue of a meter would take less than 24 hours to complete, depending on Concr3De, for a price between 2500 and 5000 euros, “5 to 10 times less than a manual cutting of stone,” explains Eric Geboers.

According to him, all parties in stone damaged by the fire can be printed in 3D: the vaults, statues and ornaments. And not worry about the quality of the printing material. “We conduct all kinds of tests to measure the durability of the material, continues Eric Geboers. We know that it is resistant to frost, mold, fire, acids and salts in a way similar to that of classic limestone.”