Thought I'd drag up this thread, for more "fun".
For the past 5 months, I've been using the script mentioned in my previous post for all my PDFs. Work flawlessly. The el-cheapo chinese printer is turning out to be a fantastic little workhorse, which somewhat surprises me. It has printed just shy of 6000 labels in that time.
Anyway, for reasons unrelated to anything in this post, I changed my default browser from Chrome to Firefox in my packing warehouse. Guess what? The print option from Firefox works perfectly fine with this printer.
So adding to the unknowns, Firefox does *something* a little different to Chrome, and it works...!
That being said, my script is tied to the key combo WIN + A . It is so much quicker to hit that button combo to print than to print using the print dialog, plus the script deletes the downloaded junk, keeping my computer a little "cleaner".