<p>This research investigates the enhancement of interfacial bonding in quartz fibre-reinforced polymer composites through CO₂ laser surface treatment. Quartz fibres, known for their low density and high strength, offer significant advantages over traditional carbon and glass fibres in terms of oxidation resistance and lightning strike protection. However, their inert nature poses challenges for effective adhesion to polymer matrices. In this study, laser treatment is employed to induce surface roughness, increase surface energy and free functional groups on the fibre surface (surface modification), after which the laser parameters were selected. The integration of Direct Ink Writing (DIW) and Fused Deposition Modelling (FDM), facilitates the fabrication of sandwich structures that leverage the strengths of quartz fibres within an ABS polymer matrix. Mechanical testing, including Tensile and Izod impact tests, reveals that selected laser treatments significantly enhance adhesive bonding without compromising fibre integrity, achieving a peak tensile modulus of 622.12&#xa0;MPa and impact resistance of 192.61&#xa0;J/m. These results give valuable insights into the application of CO₂ laser treatment for developing high-performance fibre-reinforced composites, highlighting its potential in advanced manufacturing processes.</p> Graphical Abstract <p></p>