Thingiverse
Mailbox Ball Alert
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You need a small piece of string to attach the ball to the cup.
Attach to the door of your mailbox. When the door is opened, the ball falls out of the cup. Letting you know when you've got mail.
Attach to the door of your mailbox. When the door is opened, the ball falls out of the cup. Letting you know when you've got mail.
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