With weight-reduction being a priority for industries such as motorsports and aerospace, many manufacturers have recently turned to the lightweight aluminum-silicon-magnesium based alloys, such as F357 and AlSi10Mg, when 3D printing parts for everything from race cars to rockets. Depending on the application, it’s true that more-expensive titanium alloys can have a better strength-to-weight ratio than aluminum ones, and copper alloys can provide better heat-transfer coefficients.