This is already used for large-scale construction, e.g. a 3D-printed bridge [1] was made using an industrial robot which wielded a MIG-welder fed with stainless

This is already used for large-scale construction, e.g. a 3D-printed bridge [1] was made using an industrial robot which wielded a MIG-welder fed with stainless steel thread. This system still uses chopped fibre in a plastic base, I wonder what the results would be with directed longer fibre which is laid down in the stress direction. This would necessitate a fibre cutter - a laser cutter would be the most flexible - in front of the print head so it would complicate the design but the resulting artefact would be much stronger. Such a longitudinal fibre printing head could be part of an assembly with different print heads in a revolver assembly like shown in this video. [1] https://mx3d.com/industries/infrastructure/mx3d-bridge/ https://mx3d.com/industries/infrastructure/mx3d-bridge/