Děláš si kozy?
To je snad jasný:
private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
{
Font mujFont = new Font("Arial", 14);
e.Graphics.DrawString(insertSpaces(txtRetezec.Text,1), mujFont, Brushes.Black, new PointF(100, 100));
}