I'm making a very simple project out of wood.

The plan is to take pieces of plywood (171 mm x 90mm x 12mm ) and cut these to a shape. Then when they're glued together I can shape them to fit different bathroom utensils.

I've gone ahead and modelled this in Sketchup Web. I'm wanting to be able to print the different cuts, glue them to the plywood and then cut them with my handsaw/jigsaw.

I'm finding it really difficult to print the parts of the sketchup model to scale. I know about the To Scale print option, but that still doesn't produce the result I'm after. To explain further, I want the line that is 90mm in my model to be 90mm on my piece of paper.

One way I've attempted this, draw a guide that matches the height of the PDF page (i.e. 210mm), and adjust the zoom so that the guide takes up the exact height of the PDF. This does not result in the right size when printed though.

I feel like this shouldn't be so hard.