YouTuber shows PLA component from a 3D printer that can carry more than 1,000 kilograms

3D printing often involves prototypes and decorative parts. A competition organized by Polymaker has now shown how far standard PLA can be pushed in the direction of heavy-duty functional parts. The task: a single, additively manufactured component had to carry as much weight as possible. British developer and YouTuber Tom Stanton won the competition with a component that could withstand more than a metric ton.

The conditions initially seemed manageable. Only a single printed part was allowed, which also had to be able to open and be placed around a mounting point. A closed ring would have been ideal mechanically, but was out of the question. Instead, Stanton looked for a geometry that would allow the opening, distribute the load evenly, and not simply bend under tension.

He started with two flat, C-shaped variants that function as clamps. The key feature was the interlocking teeth on the contact surfaces. Under load, these teeth interlock more strongly, so that the connection “wedges” itself in place instead of slipping. Initial tests showed that although the flat geometries held, the contact surfaces could still shift against each other.

For the final design, Stanton significantly increased the component thickness and added a hollow chamber. This allows the part to use more material in the edge zone, where the greatest stresses occur, while still saving volume. In the load tests, the component significantly outperformed the second-placed design and achieved more than twice the maximum load. In the end, a comparatively small PLA component carried over 1,000 kilograms.

The project illustrates how strongly geometry and force distribution influence the actual load-bearing capacity of a 3D-printed part. By specifically directing load paths, designing form-fitting contact surfaces, and minimizing weak points such as shear or sliding surfaces, even a brittle thermoplastic such as PLA can be made capable of withstanding unexpectedly high forces.