UltiMaker uses functional, analytical and tracking cookies. Tracking cookies enhance your experience on our website and may also collect your personal data outside of Ultimaker websites. If you agree with the use of tracking cookies, click “I agree, continue browsing”. You can withdraw your consent at any time. If you do not consent with the use of tracking cookies, click “Refuse”. You can find more information about cookies on our Privacy and Cookie Policy page.
I recently encountered that issue also.
Here's how to fix it.
In the 3d Print Environment on inventor
-go to print options
- set units to millimetres and Resolution to high
-Click ok and export your STL file.
It should work normally then