  Recently, a non-thermal excess noise, compatible with the theoretical
prediction provided by collapse models, was measured in a millikelvin
nanomechanical cantilever experiment [Vinante et al., Phys. Rev. Lett. 119,
110401 (2017)]. We propose a feasible implementation of the cantilever
experiment able to probe such a noise. The proposed modification, completely
within the grasp of current technology and readily implementable also in other
type of mechanical non-interferometric experiments, consists in substituting
the homogeneous test mass with one composed of different layers of different
materials. This will enhance the action of a possible collapse noise above that
given by standard noise sources.
