Hello Lexville, so you want to print your file from the model space...

I find it odd that you drawing is metric but that you reference the paper size you wish to plot to in inches.  

Are you printing directly from model space or will you be using a paper space layout?

Are you trying to print all three floor plans on a single sheet or will it be one floor plan per sheet?

Update

I created a layout and specified a A4 paper size with a portrait orientation.  I then created a viewport and applied a scale to it that would give me a reasonable view, and ultimately a reasonable print out, of the floor plan on the far left.  Unfortunately the only scale that seemed to work in this case was 1:.05 not 1:50.  Did you draw your floor plans "to scale" as one might do manually on a drafting board?  50 divided by .05 = 1000.   1000mm = 1m.  Hmmmm.......very interesting don't you think?