I have made different coloured boxes to store my screws and other fixings in.
I thought having different coloured boxes makes things easier.

I created the compartments based on the screws and bolt sizes I had.

For the lid I used transparent PLA, it took a while but I finally learnt about drying filament.
You can see the difference! no more wavy lines.

Infill can be anywhere above 30%

I recommend increasing the walls to at least 1.2mm (especially on the Lid)