UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.41 Safari/537.36

Example URL:
https://docs.google.com/spreadsheets/d/1SO6JzKuuGyJG6bKNzZQS0FDRtb4Wh6mR4jT2SPadonc/edit?usp=sharing

Steps to reproduce the problem:
1. Open a new google spreadsheet on desktop chrome browser
2. enter any random text in a few cells
3. hit either the printer icon or menu bar -> File -> print icon

What is the expected behavior?
The print preview should show the usual very light cell borders. They should only apply borders should i explicitly chose to do so from the file menu.

What went wrong?
Now the cell borders appear to be excessively bold. There is no way to make them go away (say by selecting no borders from the file menu). Nor does the change of the border from thick line to dashed to thin line appears to be having any effect. There is also no effect even if choose to only 'apply' top borders.
Opening older spreadsheets, say from 2012, shows the same thing.
Also see this product forum discussion - https://productforums.google.com/forum/?utm_medium=email&utm_source=footer#!msg/docs/Zq5DTrVFcYA/JVZ8MYJqAAAJ

Does it occur on multiple sites: Yes

Is it a problem with a plugin? No 

Did this work before? Yes Even a few days ago.

Does this work in other browsers? No firefox/chrome canary

Chrome version: 54.0.2840.41  Channel: beta
OS Version: OS X 10.12.0
Flash Version: Shockwave Flash 23.0 r0

as far as i can tell, the element being printed is a canvas, and so i could not troubleshoot any more by trying to modify styles that i thought were being applied to individual cells.