The airbrush kit I bought had the worst foam and plastic insert, with an otherwise well thought-out case.

I drew this insert to hold all of the parts that come with the kit, which previously didn't fit in the space provided.

Printed at 15% infill in PETG, no supports required

This should printe equally well in PLA or ABS, and I also printed a resin version when I was test-fitting it (and my FDM was busy) and it worked just fine.

I hollowed a lot of the body out to make it look cool, and also to let the cups/tips etc dry out better if they are put away while wet

I also cut a little section of the case away at the back so I didn't have to wind the airhose up and stuff it away each time, that little half-circle you  can see on the original case but the one on the other end.

:)