Did you buy a U.S. General magnetic tray from Harbor Freight? Are your screwdrivers flopping around in their holder? Look no further than this model here! It slides onto the sheet metal that already exists and provides some extra stability for your screwdrivers. 

PRINT SETTINGS: Standard 0.15mm Layer Height Settings or finer. Print as oriented to maintain the accuracy of the slot and the 3/8" holes.

Once printed, it should slide onto the sheet metal and all of the holes should be lined up. If you need help or you encounter an issue, leave a comment and I will answer as quickly as I can. Happy printing!