There are certain things cold spray AM cannot print without the...

There are certain things cold spray AM cannot print without the introduction of supplementary 3D AM methods. Simple high-resolution vertical structures, for instance. Check out this 2013 London study:
http://www.academia.edu/27339202/Po...ic_spray_as_additive_manufacturing_technology

Excerpt below:

The particular feature of cold spray is the shape of deposits; if the K value is low then thin, flat tracks are obtained. If the K value is high, the tracks become rounded and eventually develop a sharp triangular profile[7]. It is important that such shape of thick track could not be avoided by variation of nozzle traverse speed or powder feed rate. In other words, several "rapidly" deposited consecutive tracks will lead to the formation of this triangular shape as well, as one “slow” track. Pattison et al. [7] explain this feature by influence of the following factors: Firstly, the particle distribution in the jet is quasi-Gaussian [35]. Secondly, deposition efficiency decreases with distance from the center of the jet due to the particle velocity profile across the nozzle exit and the increasing angle of impact [7, 35, 36].When these factors combine, a greater degree of deposition is observed in the center of the jet that eventually causes the track profile to become triangular. In this situation, building of vertical wall by consecutive deposition of tracks seems to be impossible.

There are some "cheat" workaround methods to this discussed in the same paper, but it is just one example of the limitations of cold spray printing. There are other research papers that detail more limitations released around 2008 when the MIL-STD 3021 standard for cold spray materials deposition first came out, but I can't remember their titles.