I edited the original by methlon to fit the exacto handle by biketiger (https://www.printables.com/de/model/493829-xacto-scalpel-handle-v2).
I also added groves to store lots of these blades. https://www.amazon.de/gp/product/B07Z6D8X74/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Should also fit simple triangular blades with an angle ≤ 22°.

Using supports for the gridfinity magnet holes is recommended. Otherwise trivial print.