Does not print to scale anymore

I always use Rhino to print actual size prints and all the sudden it does not work.
I printed a 1 inch block and it measures .66 inches



could this have anything to do with an update?
the part in the pic i have 3d printed it and the dimension was perfect.
I have never had this happen before.
am i missing somthing?

i think i have fixed it. the paper size was set to something other than “Letter”
now it is working as expected. One thing it has stopped picking up the default printer and paper size3, it always defaults to Rhino PDF.
how to I get this to save to my default printer and “Letter” size?
it has just started in the past week.