How to remove red form field border for entire PDF on Document Will Print event?

I have a very large form where I have set the border color to red on multiple fields because they are important to check but may not be required. We're talking 100+ Fields some unique and some duplicated.

Now that I have finished making the form I am trying to determine the best way to make the red borders show up for users filling in the forms but not print when they print the forms.

I was hoping to work out a solution that would change all text fields, radio buttons, check boxes etc to transparent border using the strokeColor property like so from the DC SDK Documentation:

for ( var i=0; i < this.numFields; i++) {
    var fname = this.getNthFieldName(i);
    var f = this.getField(fname);
    if ( f.type == "text") f.strokeColor = color.transparent;
 }

However this has not worked on the Document will print event.

I was trying to get the bare minimum to work too as worst case scenario I could just get every field with red borders individually and turn them transparent but this also failed:

 function border(){
var f = this.getField("fieldname");
f.strokeColor = color.transparent;
 }
// alternatively
this.getField("fieldname").strokeColor = color.transparent;

Any help would be really appreciated! Thank you!