Boundary lines for A7 flash cards

Question

I am trying to make a template for A7 flash cards on A4 papers. I found a code similar to this that uses pgfpagesuselayout:

\documentclass[a4paper, landscape]{article}
\usepackage{pgfpages}
\usepackage{pgffor}
\pgfpagesuselayout{8 on 1}[a4paper]
\pagestyle{empty}
\usepackage{showframe}
\usepackage{geometry}
\newgeometry{right=10cm,left=1cm} 
\setlength{\marginparwidth}{9cm}
\begin{document}
\foreach \n in {1, ..., 8}{something!\newpage}
\end{document}

which produces:

The command \usepackage{showframe} displays the text, margin, header and foot boxes in addiction to the boundary lines between the flashcards.

I want to remove these boxes and just keep the boundary lines. Is that possible? is there an option for the showframe command that allows that? or is there another command that does just that?

Answer 1

You can just grab the page boundary lines from showframe's code:

\documentclass{article}
\pagestyle{empty}
\usepackage{geometry}
\geometry{
  paper=a4paper,
  landscape,
  right=10cm,
  left=1cm,
  marginparwidth=9cm
}
\usepackage{pgfpages}
\usepackage{pgffor}
\pgfpagesuselayout{8 on 1}[a4paper]
\usepackage{eso-pic}
\AddToShipoutPictureBG{%
  \AtPageLowerLeft{%
    \framebox(\paperwidth,\paperheight){}% From showframe.sty
  }%
}
\begin{document}
\foreach \n in {1, ..., 8}{something!\newpage}
\end{document}