Scaling Issues with 1:1 scaling print

[Canwin1]

Hi there, I have printed a 1in x and y square and when I go into design and choose 1:1 scale and then click print. 
I check the paper and its printing at .975 of 1 inch. What is causing this?

But if I export the pdf and print it in chrome its the correct size. what gives?

[ahreum.ryu]

Hi @Canwin1, 

Thank you for your posting! 

I think it's because of drawing size. 

for example, The SheetSize A is 8.5 in x 11 in which is a Letter size in the print option. However, the real paper size is 8.26in*11.69in (210mm*297mm)

I tested it with "mm" which means I did fit the Fusion drawing size and real paper size and it's the same as I expected. 

Please let me know if I misunderstand. 

Many thanks,

Ahreum. 

[Canwin1]

where did you find these print settings?

[Canwin1]

drawing size? its 1inch exact on x axis and 1 inch on y axis, I changed my printer preferences under device settings to the mm specs you have provided and still incorrect.

[ahreum.ryu]

Hi @Canwin1, 

Thank you for your reply. 

In my case, I create a new drawing which has the A4 mm. 

And then, I did set the print setting. Here is the result. The setting properties will be different depending on the printmaker.  

If you can't resolve it, Please share your drawing file I will test it on my side. Here is how to share it. 

Many thanks, 

Ahreum.

[edwardsc3]

Canwin1, you are correct and Fusion is printing at an incorrect scale. I did some testing at posted it to https://forums.autodesk.com/t5/fusion-360-design-validate/1-1-scale-in-drawings-is-actually-96-3-eve... and even included a comparison with a different sketching program.

I'm using the 8.5"x11" pages (and printer settings), and I measure it as 96.4% rather than 100%. I think you will encounter this problem regardless of the sheet size.

ahreum.ryu, it would be easier to see any error on a 200mm box, as the inaccuracy would then be larger than the line thickness. At 10mm the error would be less than 0.4mm, and thus very difficult to measure.