We can't actually go down to 8px, because of the ripple, but I have a CL that is reducing significantly the padding for the other options settings. Once it lands in Canary I will update this bug so you can check and see if it is still too large.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5e659696b565b65c4b89a2d117c8b4dba5cf30f9

commit 5e659696b565b65c4b89a2d117c8b4dba5cf30f9
Author: rbpotter <rbpotter@chromium.org>
Date: Sat Sep 22 01:13:17 2018

Print Preview Refresh: Fix some spacing issues

(1) For cr-input: Do not apply cr row container mixin to inner div.
This was done accidentally while adding the prefix slot.
(2) Adjust heights/margins so that collate checkbox ripple is not cut
off and collate does not cause the copies section to shift when it
appears.
(3) Ensure collate breaks the word if it is too large, to fix possible
issues with large font sizes/languages where "collate" translates to
something with a very long word.
(4) Reduce checkbox padding - this helps with collate and aligns with
UX request to reduce checkbox padding to as little as possible, without
cutting off the ripple.
(5) Add margin-top: 16 for settings sections, which allows extra
padding applied to more-settings when expanded to be removed (fixes
animation issue).

Bug:  887837 ,  887839 , 887704
Change-Id: I9d3a9bc468ce0ee5b4a2ecfb136233d3a1054902
Reviewed-on: https://chromium-review.googlesource.com/1239333
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593403}
[modify] https://crrev.com/5e659696b565b65c4b89a2d117c8b4dba5cf30f9/chrome/browser/resources/print_preview/new/copies_settings.html
[modify] https://crrev.com/5e659696b565b65c4b89a2d117c8b4dba5cf30f9/chrome/browser/resources/print_preview/new/more_settings.html
[modify] https://crrev.com/5e659696b565b65c4b89a2d117c8b4dba5cf30f9/chrome/browser/resources/print_preview/new/more_settings.js
[modify] https://crrev.com/5e659696b565b65c4b89a2d117c8b4dba5cf30f9/chrome/browser/resources/print_preview/new/number_settings_section.html
[modify] https://crrev.com/5e659696b565b65c4b89a2d117c8b4dba5cf30f9/chrome/browser/resources/print_preview/new/other_options_settings.html
[modify] https://crrev.com/5e659696b565b65c4b89a2d117c8b4dba5cf30f9/chrome/browser/resources/print_preview/new/print_preview_shared_css.html
[modify] https://crrev.com/5e659696b565b65c4b89a2d117c8b4dba5cf30f9/chrome/browser/resources/print_preview/new/settings_section.html
[modify] https://crrev.com/5e659696b565b65c4b89a2d117c8b4dba5cf30f9/ui/webui/resources/cr_elements/cr_input/cr_input.html