I have been using the SVG portion of the Elekscam software almost exclusively for a good bit of time, the issues that I had were resolved by setting Inkscape's "SVG viewbox Scaling" to 1.0, making sure that the display units are set to mm, and the units under custom size are in px.
That should resolve the scaling issues, but in the case that what you are engraving/cutting has more than one object, you will want to make sure that under Preferences/SVG output you are using Path Data:Absolute, and Force Repeat Commands, at least in my experience.
I had seen this post and others like it in the past, but just worked up the courage to actually post any thing.
Best of luck, and I hope this helps.
Posts made by Gabriel Denison
RE: .SVG import size scaling issue