This is a remake of alaubham 'Tap / Die Tray for 12 Piece Irwin Hansen Metric Set'. I added the small slots to make access to the parts and added a cover case. The cover was printed in PLA and the tray with PETG becasue that is what I had. I do not think the material makes any difference.
The 2.25" x 4.25" data sheet is handy. I gives the drill size for the metric taps. I got the information from engineering tables and rounded them. Most of use do not have the actual drills suggested so I picked something close but even the 'close' will not be something you have - just do the best you can without over boring the hole.