These are 2 halves to a magic 8 ball project I am making using an Arduino. One half has a flattened spot 2.75" across printed at 5.5". They connect in the middle with a tapered lap joint.
I have added an embossed 8 to the top half and created a cutout for the LCD screen in the bottom half.

I created part in autodesk inventor in inches, so it doesn't import full size using Makerbot software. I scaled it up to 140mm. and printed low quality in PLA at 220 C. 10% fill. The bottom (with flat) no support, no raft. The top supports only.