Tensile Modulus (aka Young's Modulus) is a measure of how stiff a material is. Specifically, it's a measure of how much a material stretches under load. (Diamond has a very high tensile modulus while rubber has a very low tensile modulus.)
Ten years ago, people were 3D printing in plastics with a tensile modulus of under 1,000 MPa and they were happy with that. Today you can print in DSM Somos NanoTool which has a tensile modulus of 11,400 MPa. Keep in mind this is a plastic. ( Source: http://www.dsm.com/en_US/downloads/dsms/NanoTooleng_10.09.pd... )
If you need even stronger materials then you should consider using an SLS (selective laser sintering) printer that can build products in titanium, aluminum or steel. Imagine how many ants could safely walk across a bridge 3D printed in any of these!
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