Hi @kai_Fiin,
Thanks so much for sharing the details. I can imagine how frustrating this must be after putting so much effort into your artwork.
It sounds like the issue might be related to the way your paths are built and prepared before export. When using the Paintbrush tool, Illustrator creates paths with many anchor points, especially for detailed freehand drawings. Too many points can sometimes cause problems when the file is opened in other software.
To improve this, I suggest simplifying your paths in Illustrator. You can go to Object > Path > Simplify and adjust the settings to reduce the number of points while keeping the shape close to your original design.
Just to understand better, is this the first time you're trying this workflow or has it worked fine before and now suddenly broken? It would also be a good idea to check with the EZCAD team to see if there are any known limitations on their side when reading detailed Illustrator files.
Looking forward to your update!
Abhishek