To use it. insert one side of the broken strap halfway into the 3d printed patch. then put some super glue from the other side and then insert the secund part of the strap fast and make sure its all in. You can use a flashlight to shine through it to see if the straps are close tougether or not.

Print with a brim so it dosn't release from the buildplate while its printing. And maybe a bit higher temp to make it stronger.