Aligning and merging 2 obj files can be a crucial step in 3D modeling and printing. MeshMixer is a powerful tool that can make this process quick and easy. Here's how to do it:

1. Open MeshMixer and import the first obj file that you want to align and merge.

2. Go to the 'Edit' menu and select 'Transform.' This will allow you to move, rotate, and scale the object to align it with the second obj file.

3. Once you have the first obj file positioned correctly, import the second obj file into MeshMixer.

4. Use the 'Transform' tool again to position the second obj file so that it aligns with the first obj file. You may need to rotate and scale the second obj file to achieve a perfect alignment.

5. After the two obj files are aligned, you can merge them together. Go to the 'Edit' menu and select 'Combine.' This will create a single, merged obj file that contains both of the original obj files.

6. Finally, export the merged obj file by going to the 'File' menu and selecting 'Export.' Choose the file format and location for the merged obj file, and then click 'Save.'

By following these simple steps, you can easily align and merge 2 obj files using MeshMixer. This can be incredibly useful for 3D modeling and printing projects, as it allows you to combine multiple objects into a single file. Whether you're creating 3D designs for art, engineering, or prototyping, MeshMixer is a valuable tool for simplifying the process of aligning and merging obj files.