This is a Gridfinity-compatible holder for the Hex Scraper (https://www.printables.com/model/122894-hexscraper-printbed-scraper).
The example print was printed on a stock Ender 5 Pro using Das Filament PLA. Layer height was .2mm and infill 15%.
It fits perfectly with a tiny bit of wiggle room (.25mm in all directions).
The author remixed this model.