Apparatuses and methods for electroporation

An apparatus comprising:

• a plurality of cuvette holders, wherein each cuvette holder is configured to hold a plurality of cuvettes and includes a bottom having a thermal conductivity greater than 150 W/(m K), a sidewall having a thermal conductivity greater than 150 W/(m K), and a plurality of cuvette positioning features, wherein:
• the sidewall and the bottom are in thermal connection with each other and at least partially define an internal volume of the cuvette holder, and
• each cuvette positioning feature is configured to restrain a movement of a cuvette that is inserted into the internal volume such that a portion of each cuvette that is inserted into the internal volume is in thermal connection with the sidewall;
• a plate having a thermal conductivity greater than 150 W/(m K) and including a first surface and a plurality alignment features, wherein:
• each alignment feature is configured to restrain a movement of a cuvette holder that is positioned on the first surface with respect to the first surface, and
• the bottom of each cuvette holder that is placed on the first surface and restrained by at least one alignment feature is in thermal connection with the first surface;
• and
• a fluid flowpath in thermal connection with the first surface.