Espaçamento entre tcolorboxes

Question

Gostaria de fazer etiquetas para impressão mas gostaria de ter espaçamentos maiores (vertical e horizontal) entre as etiquetas. Estou trabalhando com tcolorboxes e aqui está meu código:

\documentclass[a4paper, 10pt]{article}

\usepackage{geometry}
\geometry{hmargin=2cm,vmargin=1.9cm}


\usepackage{tcolorbox}
\tcbuselibrary{raster}

\newtcolorbox{cadreint}
{
  arc is angular,
  colback=white,
  arc=4.5pt,
  boxrule=1pt
}

\newcommand{\etiquette}[1]{\begin{cadreint}\vspace{#1}\end{cadreint}}

\begin{document}
\thispagestyle{empty}

\begin{tcbitemize}[raster columns=2,raster equal height,
colframe=black,colback=white, arc is angular, arc=8pt, left=1.1pt,right=1.1pt,top=1.1pt,bottom=1.1pt, boxrule=2.4pt,]
\tcbitem[]
\etiquette{3.9cm}
\tcbitem[]
\etiquette{3.9cm}
\tcbitem[]
\etiquette{3.9cm}
\tcbitem[]
\etiquette{3.9cm}
\tcbitem[]
\etiquette{3.9cm}
\tcbitem[]
\etiquette{3.9cm}
\tcbitem[]
\etiquette{3.9cm}
\tcbitem[]
\etiquette{3.9cm}
\tcbitem[]
\etiquette{3.9cm}
\tcbitem[]
\etiquette{3.9cm}

\end{tcbitemize}

\newpage
\thispagestyle{empty}
\begin{tcbitemize}[raster columns=3,raster equal height,
colframe=black,colback=white, arc is angular, arc=8pt, left=1.1pt,right=1.1pt,top=1.1pt,bottom=1.1pt, width=(\linewidth-9)/3, boxrule=2.4pt,]
\tcbitem[]
\etiquette{2.9cm}
\tcbitem[]
\etiquette{2.9cm}
\tcbitem[]
\etiquette{2.9cm}
\tcbitem[]
\etiquette{2.9cm}
\tcbitem[]
\etiquette{2.9cm}
\tcbitem[]
\etiquette{2.9cm}
\tcbitem[]
\etiquette{2.9cm}
\tcbitem[]
\etiquette{2.9cm}
\tcbitem[]
\etiquette{2.9cm}
\tcbitem[]
\etiquette{2.9cm}
\tcbitem[]
\etiquette{2.9cm}
\tcbitem[]
\etiquette{2.9cm}
\tcbitem[]
\etiquette{2.9cm}
\tcbitem[]
\etiquette{2.9cm}
\tcbitem[]
\etiquette{2.9cm}
\tcbitem[]
\etiquette{2.9cm}
\tcbitem[]
\etiquette{2.9cm}
\tcbitem[]
\etiquette{2.9cm}
\end{tcbitemize}
\end{document}

Aqui em vermelho claro é onde quero que fique maior (mas tudo bem se o espaçamento também for maior nos outros lados das etiquetas).

Desde já, obrigado !!!