Would you pls let us know which table widget you used, is it core's Table or datagrid's DataTables?

Sorry for the delay. Regarding table cell/footer css color when printing, it seems the problem is because Bootstrap theme overrides the td, tf colors when printing. Our solution would be adding a css class to the cell/footer and set the css rule for that exact class to override Bootstrap's like this:

<style>
    @media print {
        /* 1. Beat the override on the cell itself */
        tfoot td.my-cell {
            color: blue !important;
        }
    }
</style>
<?php
    Table::create(array(
        ...
        "cssClass" => array(
            "tf" => function ($columnName) { 
                return "my-cell"; // or return class based on column name
            },
        )
    ));

Another solution is using table name like this:

<style>
    @media print {
        #myTable tfoot td {
            color: blue !important;
        }
    }
</style>
<?php
    Table::create(array(
        "name" => "myTable",
        ...
    ));

Let us know how this works for you. Tks,