Micro-incremental sheet forming (µISF) is a flexible manufacturing process and has advantages over existing micro-forming processes, due to its die-less nature of material deformation. In µISF, an ultra-thin foil is plastically deformed into a complex 3D geometry. It is precisely governed by the pre-defined toolpath of the forming tool on the surface of the foil. Due to size-effect, achieving high formability of the foils in micro-forming is difficult. This work investigates the deformation behavior of 100 μm thick CP-Ti Gr2 foils. The received foil is heat-treated at two different temperatures to obtain the foils with altered grain sizes. It was witnessed that the changes in annealing temperature and grain size enhanced the formability of the micro-parts. The foil with a higher grain size helped in increasing the fracture limit of the formed components.