  We present an additive-manufactured microwave cavity for a Ramsey-type,
double resonance, compact cold-atom clock. Atoms can be laser cooled inside the
cavity using a grating magneto-optic trap (GMOT) with the cavity providing an
excellent TE011-like mode while maintaining sufficient optical access for
atomic detection. The cavity features a low Q-factor of 360 which conveniently
reduces the cavity-pulling of the future clock. Despite the potential porosity
of the additive-manufacturing process, we demonstrate that the cavity is
well-suited for vacuum. A preliminary clock setup using cold atoms allows for
measuring the Zeeman spectrum and Rabi oscillations in the cavity which enables
us to infer excellent field uniformity and homogeneity respectively, across the
volume accessed by the cold atoms. Ramsey spectroscopy is demonstrated,
indicating the cavity is suitable for clock applications. Finally, we discuss
the limitations of the future clock.
