A small design you can srew in the wall to hold your metall tools that you need very fast and often. You have to add a stop in your print that you can add the magnets.

Magnets: https://www.amazon.de/gp/product/B01H0B4OAS/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1