Dothanyul has made an excellent tool rack for the Ender 3, but I wanted to store a few extra things that I keep with my printer, such as the cleaning wire and a set of feeler gauges. I also wanted another peg to hang a tool on. So I made this tray that snaps onto the top of the rack. Below I have linked the original rack as well as Dothanyul's page.

https://www.thingiverse.com/dothanyul/designs

https://www.thingiverse.com/thing:4115776