Here is my most recent project, a Tool rack to hold all my Sherline end mill holders, as well as my 19 er16 collets, (10 metric 9 standard) as well as tommy bars, and hex keys. The holes at the top start at 1mm and increase in diameter by .5mm up to a max of 9mm. I have not printed the second version, but this included a few parts I forgot to include when I printed it, as well as allowing the use of double ended end mills in their holders. This holder can be placed directly on the bench as pictured, or can be hung on a metal wall with the use of:
https://www.amazon.com/gp/product/B07FL ... UTF8&psc=1
Please let me know if anyone wants the solidworks file, it is kind of a hot mess, because it was thrown together over my lunch break, but in that way you can adjust whatever you want.