We do have a 3D printer and I love improving my games with all sorts of little things. I did also print some 1-part, 2-part, 3-part and 4-part stackable, multicolored trays which I love and use for many game.
But my favorite is our Burgundy Hexagon - it holds all the components of the game and includes also two dice trays. I would not want to play it without it, it makes playing much more fluid. The downtime inbetween phases is super short.