support up to eight thas 100 other embodiments may be configured to support more e g 16 or fewer thas 100 by providing for a different number of rows and or columns of thas 100 the openings 202 may be spaced to in accordance with a desired droplet receptacle spacing e g microplate well spacing d 2 25 mm d 4 5 mm d 9 mm etc the frame 602 may be dimensioned to allow manipulation by microplate handling grippers and storage in microplate stacks and shelves fig7 shows a top view of a head assembly module 700 including a one dimensional array of thas 100 affixed to the frame 600 in accordance with various embodiments different liquids and or different volumes of liquid may be loaded into different ones of the receptacles 112 and the thas 100 of the module 700 may be dispensed from serially or in parallel to reduce microplate processing time electrical connections can be made to the electrical contact pads 104 one tha 100 at a time or to many or all thas 100 simultaneously fig8 shows a top view of a frame 800 configured for user insertion of head assembly modules 300 or other one dimensional modules e g 1 u00d7 2 1 u00d7 4 etc in a one dimensional array in accordance with various embodiments the frame 800 allows for provision of a user selectable number of tha modules 300 to a dispensing instrument.