I was looking for a small travel tictactoe, but didn't find one fitting my requirements, so i created this one.

It requires an MMU and PLA as well as FLEX filament.

I case you don't want to fiddle around with TPU in the MMU i have created an alternate version printed entirely from PLA. See here: https://www.printables.com/model/985728-tiny-travel-tic-tac-toe-v2

The box is a plain single-colored box made from PLA. The tolerances for the lid fit my MK4 with standrad 0.4mm nozzle very good. This might be different with other printers or configurations. It is divided to fit the playing pieces three in a row and three on top of each other in the smaller compartment and the board in a rolled up fashion in the larger compartment.

The board is only two 0.2mm layers thick and printed with FLEX (in my case extrudr flex medium) on the MMU (in my case the MMU3). to be able to print flex on the MMU, which is officially not supported and I cannot guarantee that it works properly  in your case, i followed this youtube video from https://www.youtube.com/@0calvin  and adapted it to my filament: 

This worked so surprisingly well for me, that i started printing multicolor TPU phone cases in the meantime. So i hope it works for you as well.

I wanted playing pieces that are X's and O's at the same time and can be flipped to change. So these pieces are made from PLA and printed on the MMU. On one side the X is black and the rest “invisible” (white) an on the other side the O is black and the rest “invisible” (white).

I have included the gcodes generated for my MK4, the 3mf files for the MK4 and the STLs. When you use the STLs, you will have to split the model files into Objects in the Slicer and color them by hand. On the X/O pieces you will have to add a height modifier on 1 mm height to change the colors accordingly.