Hello, I think your problem may be that you did not set the size ratio when importing. You need to set the size ratio by yourself when importing, because there is no clear size in obj format, it is just a number. Did you export the 3D model in offline mode? We suggest that you export in the collaboration mode of the standard version, or please try to update your EASYEDA Std to the latest version, but also suggest that you try our EASYEDA Pro~ I hope my suggestions can help you, I wish you a good day!!