You might want to check out Brother HL-L2390 prints as if set to A4 when set to letter · Issue #53027 · NixOS/nixpkgs · GitHub, since it looks like that’s what you’re looking for.
You might want to check out Brother HL-L2390 prints as if set to A4 when set to letter · Issue #53027 · NixOS/nixpkgs · GitHub, since it looks like that’s what you’re looking for.