This is a hexagon shaped dice tray, 29mm high (1.16") and 150mm wide (5.94") with a raised edge and thick wall for rolling your dice inside.

Inside the tray, there is text and an image that says "It's Probably Fine" with a Nat 1 D20 and that's about it!

3D printing settings

5.14" x 5.94" x 1.16" (130 x 150 x 29mm)

Takes 6h 38 minutes to print at full size. Easily resized.

I use Lychee to slice. I use an Anycubic Kobra 2 Neo, and use the default settings for .200 layer height. I added a brim to keep it from slipping. 

For FDM 3D printing. Technically could be done with resin, but it would use a lot.