I've no idea how Substance Painter is likely to need it, but this shows the seams I added in wireframe view And this shows the result after unwrapping again

Here is the resulting Blend file ](https://blend-exchange.com/b/L8aBs0Vb/.

I've no idea how Substance Painter is likely to need it, but this shows the seams I added in wireframe view:

And this shows the result after unwrapping again:

Here is the resulting Blend file:

I've no idea how Substance Painter is likely to need it, but this is how I'd mark the seams on your object ](https://blend-exchange.com/b/L8aBs0Vb/:

I've no idea how Substance Painter is likely to need it, but this shows the seams I added in wireframe view And this shows the result after unwrapping again

Here is the resulting Blend file ](https://blend-exchange.com/b/L8aBs0Vb/.