Micro-piezoelectric is the patent of Epson Brothers, and thermal foaming is the patent of Canon. Epson and Brother's micro-piezoelectric nozzles have a long service life, but they are inconvenient to maintain. Replacing the nozzle requires disassembly, and the user cannot replace it by himself. If there is no maintenance station around, it will be very troublesome, but the micro piezoelectric nozzle will generally not break down. Although both Canon and Hewlett-Packard are hot foaming nozzles, Canon's machines have maintenance parts, while Hewlett-Packard's does not. Thermal foaming is easy to block. If there is no maintenance component, the nozzle will always be exposed to the air, and the probability of blockage will greatly increase. Moreover, due to the lack of maintenance parts, the built-in cleaning function of the system does not work after plugging in, so it is necessary to remove the nozzle and scald it with boiling water. However, it is also convenient for Canon and HP to change nozzles, just like changing toner cartridges. Take the old one down, put the new one in, it can be finished in one minute, and the user can also operate it. As for the printing effect, the color of the hot bubble is warmer than that of the micro-piezoelectric type, please follow your own preferences.