The ZXPS Arduino Libraries
The ZX Printer Shield project has two Repositories: ZXPrinterLibrary and ZXPrinterTest
The are located at https://github.com/ohnosec
The ZXPrinterLibrary is very well commented and includes 5 examples sketches. Together they serve as the documentation on using the ZXPS.
The images below are a preview of what you will find when you install the libraries in your Arduino IDE.
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Above - A screenshot of the Github repositiories
Above: The ZXPrinterLibrary folder structure
Above: The ZXPrinterTester folder structure
Above: One approach to downloading the code from https://github.com/ohnosec/ZXPrinterTester.git