  As 3D printers become more widely available, researchers are able to rapidly
produce components that may have previously taken weeks to have machined. The
resulting plastic components, having high surface roughness, are often not
suitable for high-precision optomechanics. However, by playing to the strengths
of 3D printing---namely the ability to print complex internal geometries---it
is possible to design monolithic mechanisms that do not rely on tight
integration of high-precision parts. Here we present a motorised monolithic
3D-printed plastic flexure stage with sub-100 nm resolution, that can perform
automated optical fibre alignment.
