Quoted from Shaker:Yeah, the formats would be based on the tool used by the Maker. As my work is 2D, I used a decade old copy of Adobe Illustrator (CS5), and at the moment my work is in .ai format. However, within Illustrator, I can save or export my work to several other formats such as .svg and .dwg.
This is getting into the weeds just a little bit, but it's relevant and important too. Illustrator does not export SVG in a format most programs expect. As such it will often import at the wrong size. I'm adding an image with a technical explanation of why.
But the short version is this: Illustrator's SVG format is not a reliable way to share information that is a specific real-world size. Someone could use your file to cut a playfield protector and find it doesn't fit, depending on the chain of programs used to do it.
The following is an excerpt about making PCBs from SVG images, but it applies to anything else too: