Schnittrand einfügen

\usepackage{typearea} 
\typearea[current]{last}
\recalctypearea 
\setlength{\paperwidth}{216mm} 
\setlength{\paperheight}{303mm} 
\areaset[current]{\textwidth}{\textheight}

\documentclass[a4paper,fontsize=12pt,twoside,openright,parskip=false,cleardoublepage=plain,headsepline,BCOR13mm,DIV18]{scrreprt} 
\usepackage{scrhack}		     
\usepackage[latin1]{inputenc}        
\usepackage[T1]{fontenc}             
\usepackage[ngermanb,ngerman]{babel}
\usepackage{graphicx}		     
\usepackage{verbatim}		     
\usepackage{appendix}		    
\usepackage{color}		     
\usepackage{subfig}                  
\usepackage{amsmath,amssymb}	     
\usepackage{ziffer}		     
\usepackage{caption}                 
\usepackage{pdflscape}		     
\usepackage{ltxtable}	 	     		
\usepackage{float}		     		
\usepackage{titletoc}		     	
\usepackage{placeins}                
\usepackage{csquotes}		     	
\usepackage{pdfpages}                
\usepackage{pstool}		     
\usepackage[absolute]{textpos}       
\usepackage{rotating}		     	
 
\usepackage[frame,width=216truemm,height=303truemm,center]{crop}
 
\usepackage{chapterthumb} 
\pagestyle{scrheadings}
 
% Add bleed at the right side of the chapterthumb outside(!) of the paper
\newcommand*{\chapterthumbbleed}{3mm}
\makeatletter
\renewcommand*{\putchapterthumb}{%
  \begingroup
    \makebox[0pt][l]{%
      \hspace{-\oddsidemargin}\hspace{-1in}%
      \hspace{-\@oddheadshift}%
      \hspace{\paperwidth}%
      \parbox[t][0pt][t]{0pt}{%
        \vspace{-\topmargin}%
        \vspace{-1in}%
        \vspace{-\headheight}%
        \vspace{\dp\strutbox}%
        \vspace{\firstchapterthumbskip}%
        \setlength{\@tempdima}{\paperheight}%
        \addtolength{\@tempdima}{-\chapterthumbwidth}%
        \addtolength{\@tempdima}{1pt}%
        \setlength{\@tempdimb}{\chapterthumbskip}%
        \divide\@tempdima by\@tempdimb
        \@tempcnta=\@tempdima
        \advance\@tempcnta by 1
        \@tempcntb=\value{chapter}%
        \advance\@tempcntb by -1
        \divide\@tempcntb by \@tempcnta
        \multiply\@tempcntb by -\@tempcnta
        \advance\@tempcntb by \value{chapter}%
        \advance\@tempcntb by -1
        \setlength{\@tempdima}{\chapterthumbskip}%
        \vspace{\@tempcntb\@tempdima}%
        \makebox[0pt][r]{%
          \rotatebox{90}{%
            \colorbox{\chapterthumbboxcolor}{%
              \rule[-3mm]{0pt}{3mm}%
              \parbox[t][\dimexpr \chapterthumbheight+\chapterthumbbleed\relax][t]% <-- NEW
                     {\chapterthumbwidth}{% <-- NEW
              \parbox[t][\chapterthumbheight][c]%
                     {\chapterthumbwidth}{%
                \centering
                \color{\chapterthumbcolor}%
                \chapterthumbfont{\chapterthumbformat}}}}}%<-- ONE } MORE
          \hskip-\chapterthumbbleed % <-- NEW
        }%
      }%
    }%
  \endgroup
}
\makeatother
\renewcommand*{\chapterthumbformat}{\thechapter} % only number
%\renewcommand*{\chapterthumbformat}{\leftmark}% not only number but complete running head
 
\renewcommand*{\chapterthumbwidth}{4em}
\renewcommand*{\chapterthumbheight}{2em}
\renewcommand*{\firstchapterthumbskip}{3em}
\renewcommand*{\chapterthumbskip}{3em}
 
%\makeatletter
 
\EndPreamble