Custom paper size

Hi …In addition to the standard paper size i would like to add a custom paper size for invoice design…Is it possible?


@ben any thoughts?

The reason is i need to print invoice on 3inch or 72 mm thermal receipt printer…When I print the invoice in all paper size provided in invoice ninja…The print is coming out very tiny…Even if I had adjust font and custom paper size in css no effect…i hope if I can add custom size paper size other than A4 ,A5 it may resolve the issue…Is any other thought how I can achieve this?