Another Dice Tower V2 smooth tray insert

This is a "fix" for those wanting to make a smooth dice landing tray used with Another Dice Tower V2 by GrooveDachschund (kudos to the design!). The V2 tower has a deep grooved cobblestone dice tray that causes my D20 dice to often end up on their side.

To correct this, and to save on wasted plastic/time, I created a simple tray insert that fits closely to the tray's dimensions. Yeah, its a minimalist solution, but it did the job for me great! its about 1.2mm thick, so it doesn't impact the a