Stackable Jigsaw Puzzle Trays

I love doing puzzles and I also love sorting my pieces by color and shape. I looked and looked, but could not find a jigsaw puzzle tray holder that was functional for me, allows me to add as many layers as I want, and is easy to use!

So, I made one

Couple of things to note:
---------------------------------------------
I had to play a little bit with the printing quality to ensure the trays went into place easily. I did not want them to be too snug because I didn't want the trays to fling apart and pieces to go flying. I mention this because you are best to come up with what works for you. Included is a test print. I suggest printing this and getting the smoothness just as you want it with your slicer before printing the trays

You can obviously print as many trays as you want to stack. There is a lid, but you would only print that once since it is not possible to interlock and stack another tray on top of it. It's the top, why would you?!?! You can of course not print the l