By default! When it is unable to fill any further slots in the mechanical crafter, the last entry in its instructions (and lowest priority) would be to "boop" the button. I.E: If no further supplied materials will go into any available slots (slots are full / filtered to not take available items), the last remaining option is to press the button. It may be necessary to have the arm able to press the button while holding an item as well, as it'll probably try and grab items before running out of available options. I think this would work, but can't really test this idea as-is. Thanks for replying. I'd love to hear further feedback on this idea, positive or not. Cheers and best regards, Slack