I am a beginner, and I made this tray to fit only my tools. Hence the slots might not be that universal. Feel free to use it as a template and remix the tool slots yourself. 

I printed it with Bambu ABS filament. I set the walls to 6 and infill to 50%. It is quite strong and is able to hold my 1L IPA bottle without any issue. I also have test print some model with speed set to ludicrous to simulate the worse case scenario for the tool tray. Nothing falls off, so I think it is a success.