  A structured optical fibre is drawn from a 3D-printed structured preform.
Preforms containing a single ring of holes around the core are fabricated using
filament made from a modified butadiene polymer. More broadly, 3D printers
capable of processing soft glasses, silica and other materials are likely to
come on line in the not-so distant future. 3D printing of optical preforms
signals a new milestone in optical fibre manufacture.
