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We report the first observation of a superconducting transition in a 3Dprinted, metallised-plastic device. A cylindrical cavity is 3D printed from aphotosensitive polymer resin and then a 20 $\mu$m layer of tin deposited. Aresonant TE microwave mode at 13.41 GHz is observed to reduce its losses by anorder of magnitude once it is cooled below 3.72 K; the superconductingtransition temperature of tin, with the mode's $Q$ factor increasing from$2.7\times10^4$ to $4.0\times10^5$.

Metallised 3D printed plastic resonator demonstrates superconductivity below 4 K