Issue: 

How to add a PLT printer in ZWCAD?

Solution:

Click the Ribbon menu Export → Plot (PLOT command), select Add A Plotter Wizard in the Printer/plotter Name, then follow the prompts to add the PLT printer, select My Computer, select HP-LHPGL/SHPGL. After setting, you can select the plotter in the printer name and export the PLT file.