I read all the contents but still have problem with diminishing the table width. tried all the solutions they do not work or most of them same results. This should not be closed. My code is different and t he solutions do not work!!!!
\documentclass[review]{elsarticle}
\begin{table}[H]
\centering
\caption{Printing parameters}
\begin{tabular}{ccccccccc}
& Layer height, mm & First layer speed, mm/s &Printing speed, mm/s & Extruder temperature, °C & Bed temperature, °C & Extrusion multiplier & Extrusion width, mm & Fan speed, \% \\ \hline
Carbon fiber tow& & & & & & & &
\end{tabular}
\label{table3}
\end{table}
\begin{table}[H]
\centering
\caption{Printing parameters}
\begin{tabular}{ccccccccc}
& Layer height, mm & First layer speed, mm/s &Printing speed, mm/s & Extruder temperature, °C & Bed temperature, °C & Extrusion multiplier & Extrusion width, mm & Fan speed, % \ \hline
Carbon fiber tow& & & & & & & &
\end{tabular}
\label{table3}
\end{table}
\begin{table}[H]
\centering
\caption{Printing parameters}
\begin{tabular}{*{9}{c}}
& Layer height, mm & First layer speed, mm/s &Printing speed, mm/s & Extruder temperature, °C & Bed temperature, °C & Extrusion multiplier & Extrusion width, mm & Fan speed, % \ \hline
Carbon fiber tow& & & & & & & &
\end{tabular}
\label{table3}
\end{table}

$h_l/\si{\mm}$ & $v_l/\si{\mm\per\s}$ & ...(or similar) which would save a lot of space… – cgnieder Jan 15 '21 at 18:53