We performed the topology-change surgery for ring-shaped crystals of tantalum triselenide (TaSe3) to investigate the interplay between the closed-ring topology and elasticity/plasticity of the crystals. We cut the TaSe3 rings using a focused ion beam and observed that the curvatures of the open rings increased from their initial curvatures. We found that a change in the radius is proportional to inverse square of the thickness of the crystals, which corresponds to an inhomogeneous distribution of edge dislocations. From the distribution, we suggest the existence of cylindrical domain walls in the ring-shaped crystals as a result of the crystal topology.
