A method for building a three-dimensional part, the method comprising providing a printed three-dimensional part and support structure, where the support structure comprises at least two polymers having different glass transition temperatures. A culture vessel manufactured according to the steps of the method which can provide improved adhesion to cell and enhanced cell-proliferation is also provided. A virtual fence is defined around the containment area, as well as around optional exclusion zones within the containment area, during system set up through communication between the base units and a trackable device as the user walks around the desired border. The voltage regulator is configured to maintain the retention voltage across the SRAM array above a predetermined level. The method also includes delivering the presentation instruments in accordance with the purchase information. From the proprietary server 121 are read out data which is sent out via dedicated network 3 to a live PC where it is reproduced.