Wow okay I just spent a lot of money switching out EPL printers for ZPL ones as I could only find a library to convert PDFs into ZPL[1] and nothing much on EPL. I could have hand coded the labels but generating PDFs in Jasper Report Server gives much better tooling and flexibility.

Also there is a very handy online ZPL render[2]

But this tool is magical. I'll be using this in the future.

1 https://www.nuget.org/packages/PDFtoZPL/

2 http://labelary.com/viewer.html