Laser Engraving Not Scaling Correctly


I created a drill guide in Adobe Illustrator that I wanted to use to engrave on a work piece for drilling. I scaled it in Illustrator in mm. When I export the artwork and engrave it on a test piece, it is smaller than what it should be. When I print it out from Illustrator on my laser printer, it is exact. How do I ensure engraving at 1:1 in Flux? I’ve tried PNG and BMP images and both scale incorrectly.