Book Binding Tool for 4x4 Inch Notebook Covers (read description)

This is a 3D printed book binding tool for 4x4 Inch Notebook covers.  NOTE:  This is NOT the size of a 4x4 piece of paper, but it is for a cover, which means it is about 6mm longer width-wise and length-wise, so that the cover would hang over the edge of the 4x4 inch sized paper.