The installed medium β ALPI cavities were produced by Nb sputtering on old Cu substrates, which were originally Pb plated. The cavity renew could practically double the previous average operational accelerating field but the performance obtained in high β resonators, whose Cu bases were designed to be sputtered, could not be reached [1, 2]. To overcome this performance gap, we designed, built and tested a novel medium β cavity, which has the shorting plate rounded as in high β cavities, while the beam ports are obtained by plastic deformation of the outer conductor instead of being brazed to the cavity body as in the previous medium β QWRs. The paper describes cavity design, substrate construction technology, surface treatments and results of the first resonator cold test.