Stack Fetch Modus
The Stack Fetch Modus is a fetch modus which only allows you to access the last item you inserted.
This is considered the least useful modus. Any item that you pick up displaces the item you were using, so you cannot mine without constantly dropping blocks and picking them back up. If you happen to start with a stack modus, upgrading to the Queue Fetch Modus as soon as possible is recommended.
It can be used to craft a Queuestack Fetch Modus.