Because it is determined by a large nonlinear differential system that, moreover, depends on many parameters, a complete exploration of the magnetization dynamics defined by the models of the DNP NMR maser proposed in this work is a formidable task. Nevertheless, we here illustrate by dynamics simulations the effect of the shape of the sample on the DDF, and on the magnetization dynamics. We considered the dynamics of model (A) for a specimen with the shape of a flat disk or an elongated cylinder. Results are depicted in Figure ). Simulations were performed with identical parameter values to show the pure effect of the sample shape on the dynamics. They show similar behaviors, with at short times, the series of maser bursts, followed by a transient stage of sustained precession in the intermediate region, and an evolution towards thermal equilibrium in the long term, when no significant radiation damping is present. However, the details of the maser pulses , in particular, are different, and can be ascribes to the different values of the DDF, therefore of the ω dip /γ rd ratios due to the different shapes of the samples. Nevertheless, as expected, the overall characteristics of the dynamics are conserved.