  Advances in laser and optoelectronic technologies brought the general concept
of optomechanical manipulation to the level of standard biophysical tools,
paving ways towards controlled experiments and measurements of tiny mechanical
forces. Recent developments in direct laser writing (DLW), enabled the
realization of new types of micron-scale optomechanical tools, capable of
performing designated functions. Here we further develop the concept of
DLW-fabricated optomechanically-driven tools and demonstrate full-3D
manipulation capabilities over biological objects. In particular, we resolved a
long-standing problem of out-of-plane rotation in a pure liquid, which was
demonstrated on a living cell, clamped between a pair of forks, designed for
efficient manipulation with holographic optical tweezers. The demonstrated
concept paves new ways towards realization of flexible tools for performing
on-demand functions over biological objects, such as cell tomography and
surgery to name just few.
