As DN suggests, using a print style sheet will work well. In the print style sheet, set your css rule to #element {display:block}.
I look at jQuery.printElement Options , and there is an option overrideElementCSS. This seems to be exactly what you need. Here is a sample code:
$("#element").printElement(
{
overrideElementCSS:[
'thisWillBeTheCSSUsed.css',
{ href:'thisWillBeTheCSSUsedAsWell.css',media:'print'}]
});
thisWillBeTheCSSUsedAsWell.css , #element {display:block}.