In line with empty impls of, e.g., event listeners. Suggested impl:

public abstract class PrinterSupport implements ElementPrinter {
  public PrinterSupport() {}
  // public abstract void print (String text);
  public void println (String text) {print(text + "/n");}
  public void markField(FieldElement ignore, int alsoIgnore) {}
  // ditto for other mark methods
}

[Make DefaultElementPrinter public instead]