Just made my first batch of precompost today (Wednesday 09/06/2023). I used the Medium and Quick settings. For my browns, I had a mix of used white printer paper (without the ink on it because my printer is laser jet), brown paper (1 toilet roll and 1 saltine cracker cardboard box with the glossy paper removed from both sides), and 1/2 of the top of a yellow cardboard egg carton.