Is it possible to print the form I made in a readable size?

Yes, this is possible. Each element of the form can be made to appear different in print than on the screen by wrapping the print-only CSS (styles) in an @media print rule. As a demonstration, here's a form which has the following rule injected:

@media print {
 .form-textbox,
 .form-textarea,
 .form-dropdown {
   font-size: 1.3em;
 }

 .form-sub-label {
   font-size: 120%;
 }
}

Complete the form without submitting it and either click its Print button or hit [Ctrl+P] to see the effect of the rule. The following video explains @media print in more detail:

http://youtu.be/tinkx4TxHrU

Feel free to clone the my demo and play around with it.

Cheers