[DrFusion]

Hi guys, Im having real difficulty printing the proton wand (stepans one) 1:1 scales drawing to the correct size. they always come out a little to small or large in relation to the refrence dimension included. I am pretty Photoshop savvy and can solve most printing problems but this one has got me proper stumped. I have imported the files into photoshop, scaled them to a perfect templete and then used Postrazor to chop it. but it still coming out to small or large.
Is the reference wrong? last one i printed was bang on 535mm on screen and measured by guides. I checked and checked again. the print settings were all correct also.
The only thing i can think of is the reference is wrong?