Try exporting in a different format. DXF is an ancient format with very poorly defined standards, which is why Glowforge abandoned the idea of supporting it directly.
Try PDF?
I know a lot of people here use F360 (I do a little as well but not for 2D) so I’m sure someone will have a suggestion.
just need to make sure youre using the correct units. DXF exports in ‘units’ so for example when importing into illustrator you have to choose inches/mm/cm etc as to what those ‘units’ are supposed to represent. Choose the correct units, get the correct size
I’ve been burned and confused by scaling multiple times. Since you are designing your own project, you could add a 100mm or 1” feature in your design. Then you can confirm the size in whatever post processing program you choose.
I’ve never had any scaling problems with my workflow but this is a great idea to add to my shared projects as I can never know what the enduser is going to open it in.