This is a Rummikub stand for the travel version of the game, where the tiles are sized 27 x 19 mm. The original stand for the travel version is very flimsy and its legs tend to break off easily. This is a larger, more sturdy version of the stand that has space for up to 34 tiles in 3 rows. Of course, these stands won´t fit in the travel pouch anymore.
To print this in 0.2 mm with 15% infill on a Prusa i3 takes about 7 hrs. You might have to turn it 45 degrees to fit it onto the printer bed before you slice it.
I have also glued some felt onto the foot for a nicer feel and to avoid scratching the table surface.