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The other kind of tridimensional printers...

Externet
in Engineering

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I forget how are they named... optical something... Is there vendors that you know of, for 'benchtop' size?

They work by shining a laser onto some fluid that solidifies when hit by its ultraviolet light. Sort of a loca glue curing layer by layer to form a solid.

Well it started with SLA (stereolithography) 3d printers. https://en.wikipedia.org/wiki/Stereolithography which was improved more recently to

CLIP (continuous liquid interface production) 3d printers https://en.wikipedia.org/wiki/Continuous_Liquid_Interface_Production

Using a process known as photo polymerization https://en.wikipedia.org/wiki/Polymerization

With a fluid liquid photopolymer resin https://en.wikipedia.org/wiki/Photopolymer

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Thank you !. Now I can find them ! Good clues.

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