Regarding 3D Printing File Processing

If I want to use the file for 3D printing models, how should I handle this file? What software should be used to synthesize them into a whole, thicken the inner wall, or make them into a solid file with no cavities inside, May I ask everyone,

Hi ! I would like to 3D print a model too ! But the files are wayyyyy too detailed (pretty cool to have details tho)
I am trying to print a tank from the War Thunder files but impossible, it wouldnt slice !!

Any help will be appreciated ;)

嗨！我也想 3D 打印一个模型！但文件太详细了（不过有细节还是很酷的）
我试图从 War Thunder 文件打印一辆坦克，但不可能，它不会切片！！

任何帮助都将不胜感激 ;)

Yes, I am learning through videos and haven't learned yet

Hello,

it is usually because the models are not "watertide". First load a model into Microsoft 3D Builder, for example, and have the mesh repaired. This can help. Another possibility is to do it via Blender - here are some tutorials to make a Watertide model. Good luck