I've googled this a quite a bit and seen a bunch of suggested tweaks that satisfied people, but I can't get anything to work, so sorry if this looks like a dupe. I'm trying to export vectors from Affinity Designer to SVG to use for a laser cutter. Every time I do, the SVG is resized. It doesn't matter what resolution or size document I use, or whether I specify an export resolution, or uncheck the "set viewBox" setting, or only export the objects and not the canvas, literally nothing produces an SVG file that preserves the actual size of what I've drawn. I've opened the SVGs in Inkscape, Lightburn, and AD itself, and they're always bigger. The first time I caught it, it had upscaled a 4" coaster to over a foot diameter.
Resizing the image in another program isn't the biggest deal if all I'm doing is a 2-D design, but if I'm cutting pieces for a box with finger joints, resizing can throw things off big time. And going from AD to Inkscape to Lightburn just to get the SVG imported for the laser cutter is a bit of a pain, so I'm really hopeful there's a fix here.
I've attached AD and SVG files of a simple square to demonstrate what I'm talking about.
Specs: Affinity Designer 1.6.5, MacOS Mojave, recent MacBook Pro.