Construction and Application of 3D Printer with Solenoid Valve Micro-jet Function

3D printing technology has been widely used in biomedicine, sensor manufacture and other fields. However, traditional 3D printers have a different application range due to their distinct working modes. It is difficult to be compatible with biological preparation and sensor preparation at the same time. Therefore, using the solenoid valve as the nozzle, a 3D printer with a unique working mode is independently designed and constructed, and the high-precision droplet distribution mode is applied to the printing of 3D structures.The effects of cylinder pressure, solenoid valve switching time and nozzle height on the print droplet diameter are studied, and the print quality of point, line, net and surface patterns is evaluated. The tissue-engineered skin with dermal papilla structure and an array flexible pressure sensor are prepared by the printer, and the cell activity of the tissue-engineered skin and the pressure-resistance conversion characteristics of the pressure sensor are tested. The results show that the