Method of transferring material from microfabricated device

A method of transferring material from a first device comprising an upper surface including a first array of microwells to a second device comprising an upper surface, wherein at least one of the first array of microwells contain at least one cell, the method comprising:

• securing an assembly comprising the first device and the second device in a mounting structure, wherein the first device and the second device are positioned in a way that the upper surface of the second device is opposite the upper surface of the first device and the relative positions of the first device and the second device are fixed;
• and
• moving the mounting structure carrying the first device and the second device toward a stopper plate, the stopper plate having an initial position apart from the mounting structure, until the assembly or a part of the mounting structure contacts the stopper plate, wherein the speed of the mounting structure immediately before the contact is sufficient to cause the transfer of at least a portion of the well content of the at least one of the first array of microwells of the first device to the upper surface of the second device.