  Longitudinal phase space manipulation is a critical and necessary component
for advanced acceleration concepts, radiation sources and improving
performances of X-ray free electron lasers. Here we present a simple and
versatile method to semi-arbitrarily shape the longitudinal phase space of a
charged bunch by using wakefields generated in tailored dielectric-lined
waveguides. We apply the concept in simulation and provide examples for
radiation generation and bunch compression. We finally discuss the
manufacturing capabilities of a modern 3D printer and investigate how printing
limitations, as well as the shape of the input LPS affect the performance of
the device.
