lightroom is printing my image at a smaller dimension than that of photoshop

[justinm20313230]

I have noticed that when I print from Lightroom, the actual image dimensions become slightly smaller on a printed copy. For example, I have laid out  4 pieces of artwork in photoshop at specific dimensions on an 8.5 x 11 canvas. This file prints perfectly at my specific dimensions in photoshop. One of the placed images measures 176mm x 54mm ( other 3 are diff.) and the images in the Photoshop print measure perfectly but, when I open this file in Lightroom, then print, the placed image becomes 174mm x 52mm. That means the other four have printed smaller as well. The 4 images are to be cut out on the crop marks but no longer have the measurements I set in Photoshop. I can't figure it out. Does anyone know why this is happening?  

[cmgap]

Can you post a screen shot of the settings  you  have in the  print module in Lr?