Investigations into the microwave surface impedance of superconductingresonators have led to the development of single photon counters that rely onkinetic inductance for their operation. While concurrent progress in additivemanufacturing, `3D printing', opens up a previously inaccessible design spacefor waveguide resonators. In this manuscript, we present results from the firstsynthesis of these two technologies in a titanium, aluminum, vanadium(Ti-6Al-4V) superconducting radio frequency resonator which exploits a designunattainable through conventional fabrication means. We find that Ti-6Al-4V hastwo distinct superconducting transition temperatures observable in heatcapacity measurements. The higher transition temperature is in agreement withDC resistance measurements. While the lower transition temperature, notpreviously known in literature, is consistent with the observed temperaturedependence of the superconducting microwave surface impedance. From the surfacereactance, we extract a London penetration depth of $8\pm3{\mu}$m - roughly anorder of magnitude larger than other titanium alloys and several orders ofmagnitude larger than other conventional elemental superconductors. This largeLondon penetration depth suggests that Ti-6Al-4V may be a suitable material forhigh kinetic inductance applications such as single photon counting orparametric amplification used in quantum computing.
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