Hello! I work on the Infinite Dimensions mod, which allows for ComputerCraft's printed pages to be used to create Infinity Portals by using the text of the paper as a seed for a randomly generated dimension. For this functionality to work, we rely on ComputerCraft's ModRegistry class for access to ModRegistry.DataComponents.PRINTOUT.

We're happy to maintain this if issues do arise from relying on the registry class like this, but as you recommended raising an issue here when relying on classes outside of the API, I thought I'd bring it to your attention that this class might have some utility outside of the mod itself, perhaps for other tech mods wanting to read user data from a printed page.

Thanks for reaching out! I probably don't want to move the whole component to the API — there's some odd implementation choices there that I probably don't want to expose to the public API. Definitely happy to expose an interface + getter for this though.

Would something like this work for what you need?:

interface PrintoutContents {
  @Nullable String getTitle();
  Stream<String> getLines();

  static @Nullable PrintoutContents get(ItemStack stack);
}

That should work nicely!