Some sort of thin foam/rubber A vice. - do NOT use a screw clamp (c-clamp) or a hammer ! a 3D printer that can print very exact, the dimensions are very tight to ensure that the cpu won`t jump out while pressing. From the responses until now it seems that the glue of the Kabylake cpu`S may be a little bit stronger, so its strongly recommended to print with high-impact material like PLA at 0,1mm layerheight or less and very high infill !