Today we did a test with the Objet500 Connex 3D printer to see how the printing process works and what the effect is of using rigid and flexible materials.
We printed three specimen (rigid, flexible and a composite) to use it for a tensile strength test next week. The pictures below show the results.
The most interesting print was the composite as with the structure inside it you can easily twist the specimen, but its inside structure prevents bending. This is done by making rigid cylinders (cores) over the length of the print and bind them together with more flexible material. The cylinders gives the composite the property to resist bending (as it is rigid over the length) while the flexible material can make the cylinders move dependent from each other and therefore twist.
Our specimen prints are processed by the connex printer
The printing result. The pink material is support material which needs to be cleaned with a water jet ot by scratching it off. The total printing time was 30 minutes.
This picture shows how the composite specimen can easily be twisted due to the combinations of rigid and flexible materials. Bending it is quite impossible though.