We often get asked how strong our FDM 3D printed parts can be. The answer of course is.. It really depends on the size of the component, the parameters used for printing and the material chosen.

But to give people an idea of how strong a £D print can be we created 2 coat hook designs and loaded them to failure to see just how much load can be taken through a simple printed part

Before we go too far into the results we need to know that the main limitation of 3D printing is that the component is built in layers. If a 3D printed component is subjected to load which is largely parallel to these layers it will fail at a relatively low load due to delamination. If we want our hooks to be as strong as possible we need to make sure our layers are perpendicular to the force applied.

Back to our hooks… We designed 2… the first one, printed in red ABS, is a simple hook printed on st standard setting with around a 40% infill, the second one was printed in orange ABS and strengthened with webs on either side, his was printed at 70% infill. We were confident both of these designs would take a load over 30Kg because we conducted a simple structural analysis using SolidWorks before the test. However we were surprised just how much load the two hooks were able to take.

The first hook failed at a very impressive 37.4Kg. The failure mode was not catastrophic, The hook simply uncurled and sprung back into shape, although there were some signs of damage on the inward face of the hook, we are confident it would safely hold at least 50% of the failure load without issue. The second hook did not fail, we loaded it to over 50Kg, which was the highest force we could measure at the time of testing and again there were some small signs of damage.

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These results are of course far from conclusive, and we have has small components break in our hands after removing them from the machine. However, hopefully you found this insight into FDM 3D printing interesting and whilst is shows that 3D printed parts can withstand high loads, it should be understood that these designs have been optimised and orientated to give the best possible results.

If you would like to compare the strength of your own 3D printed components, please contact us. We are more than happy to share our STL file for you to print and would love to know what results you get…

Contact us for more information