<p>In this study, gas-atomized CuSn10 powders were used as raw materials to manufacture 3D-printing CuSn10 samples via powder extrusion printing (PEP) technology. A laser powder bed fusion (LPBF) CuSn10 sample was prepared for comparison. The friction and wear behaviour and corrosion resistance of CuSn10 alloy were investigated. The results showed that the PEP samples prepared from unscreened CuSn10 powders had high porosity, wear rate, friction coefficient and corrosion rate. However, the properties could be improved by adjusting the powder particle sizes, including friction and wear behaviour, wear surface roughness, corrosion resistance and so on. In particular, the PEP CuSn10 samples prepared from less than 1000 mesh powders exhibited the lowest wear rate, friction coefficient and corrosion rate, which were 3.06 × 10⁻⁶ mm³ N⁻¹ m⁻¹, 0.565 and 0.0411 mm per year. In addition, the PEP samples prepared by the combination of coarse and fine powders exhibited a relatively smooth wear surface. On the contrary, the wear surface of the LPBF sample had some large furrows and high surface roughness after performing the friction and wear test.</p>