I was asking if the label creation flow is the new eBay label flow or the old classic one because it could be yet another glitch in the new label creation flow
Those URL fragment you posted is a Pitney Bowes URL that points to the final label images. When those print too small when accessed directly it's usually indicative of the browser print settings being wrong and scaling the print for everything. When the "Print Label" button is clicked on an eBay page, the label is sent to the browser as a PDF document.
The Pitney-Bowes URLS may stay live for 3-4 days (in spite of only being able to reprint via eBay for 24hours). If you have a complete URL you could try printing again. (unfortunately if what you have is the header printed by the browser on all printed pages, it is often truncated and incomplete)
The next time you create a label try the link in "If your label prints too small, open the label window and click Print Label." that is above the label preview image. High resolution images of the label lurk in there that can be printed.
If you want, PM one of the complete* URLS if you have one, and I'll take a look at the labels and see if there is anything wrong with them.
*should be of the form https://ibdswebp28-ext.pb.com/images/USPS/HTMLFolders/HTML10/p7a982ee9-ae97-4990-acbc-39db9d795ab4.h... or similar (that specific URL is munged and invalid)
Some old, but maybe applicable info here:
https://community.ebay.com/t5/Archive-Selling/Recent-Firefox-Blank-Page-Shipping-Label-Printing-Info...
https://community.ebay.com/t5/Archive-Selling/Printing-Return-Shipping-Labels-as-Images-for-eBay-Mes...
The fact that your packing slips are tiny tells me it isn't eBay or Pitney Bowes - the packing slips are fairly simple HTML pages not PDF documents or image files, and if they are scaling too small it is likely your browser. Not sure what invoices you refer to printing, but again, likely fairly plain HTML like the packing slips.
What happens when you print another eBay page like this one? https://www.ebay.com/ship/prf/carrier
Does it print "normal" size or is it scaled down to a tiny size?
Another thing to try is to flush the cahce of your browser and see if that makes a differenc. Maybe you have a corrupt eBay CSS file stuck in there has mangled media print rules that could be causing the problem (it absolutely can happen - I use my own CSS rules in Stylish addon to resize and scale Amazon packing slips and order details pages)
When you print eBay shipping labels are you using Adobe or the built in preview in Firefox? If using the built in preview that may be part of your problems - eBay and PayPal labels do not print correctly with the native PDF handler.
Another thing you might try if you print an eBay label again is to save it to PDF, and then print it outside using Adobe, Foxit, Sumatra, or whatever PDF reader/editor software you have (I think Win 10 has something native?).
Sorry for the scattered thoughts, but I'm not sure where your problem is, and trying to narrow it down.
