Improved Rummikub Rack Holder

My original Rummikub game only came with four racks/holders, but we often would like to play with five or six people.  So I improved upon the original design by making it more sturdy.  

The original game came with enough tiles to allow for more than four players.  Five or six players it not a problem.  

I recommend to print it with Prusa PLA with 10-15% infill at 0.2mm height.