TL;DR: It lets me change the print scale to 101-200% for pdfs, but making it bigger doesn't actually change the preview image or resulting print, it just leaves it at 100%. As far as I can tell, making the pdf smaller than 100% works as it should and the print scale for websites works as it should for all possible sizes.

I wanted to print some labels and to do so I need to get the size exactly right, so I printed the page normally and measured the size of the page I printed and compared it to the size of the labels, 262 & 272 respectively. 272/262 = about 103.8% so I tried setting the scale to 103% and printed it again, but when I measured that page it was exactly the same as the 100% scale. Then I looked back and realized that although the preview reloaded whenever I raised the number the image didn't actually change, setting it to 200% looked the same as 100% and 150% and etc. I think this must be a bug, but so that's one part of this, but does anyone know of any workarounds in the meantime?