For aluminium substitution in structural parts, PA802CF (89 MPa, carbon-fibre-reinforced PA11) and Carbon LW (56 MPa) are the best 3D printing alternatives. Metal-like stiffness at 30-50% lower weight. Ideal for drone frames, robot brackets, motorsport parts and jigs. Not suitable for extreme temperature (>120 °C continuous), thread joints under high load, or parts with permanent screw coupling.
Why fibre-reinforced SLS can replace aluminium
Aluminium 6061-T6 has ~275 MPa tensile and 69 GPa E-modulus. On paper SLS looks much weaker. Two caveats.
One: many aluminium parts are dimensioned on stiffness, not tensile. For stiffness, lower E-modulus suffices if you use more cross-section.
Two: PA802CF and Carbon LW weigh about half per volume. For drone frames, motorsport brackets and industrial robot parts you can go thicker without weight gain, and cut out CNC machining complexity.
When 3D print aluminium substitution works well
Structural parts loaded but without needing threaded joints: brackets, holders, frame elements, robot end effectors.
Parts where weight saving is critical: drones, hand-held equipment, wearables.
Complex geometry that CNC cannot afford: topology-optimised brackets, integral cable management, internal cooling channels.
Aftermarket auto and motorsport parts where small runs and fast iteration matter more than absolute cost. Structurally saving 30-50% on production and 40-60% on weight is realistic.
When aluminium stays better
Thread joints under high load (bolts, screws repeatedly cycled). Extreme temperatures (>120 °C continuous). Intense abrasion.
Also: sealed enclosures that must be conductive (EMI shielding). And large runs of simple geometry (>10,000 pieces per year) where CNC aluminium is cheaper per piece.
On the fence? Our engineers gladly work through whether the substitution is technically and economically right for your specific part.