Tried print to pdf to mitigate the issue, but seems to still have the anomaly. It would be great if the user had more control.
looks like no difference between 300dpi and 150dpi – at first glance, but later I think it helped…
print preview:
print result:
rectangular_plate_150dpi.pdf (197.8 KB)
Hmm, this looks like it might suffice:
Now, I’ll have to try printing the pdf to the printer 
Looks like the print came out as it looks in the pdf. I wish Rhino would print this from the get go.