Grab some of hello Kitty's brain tissue. This model should fit over a square tissue box with dimensions: 4 3/8 inches wide x 4 5/8 inches wide x 5 3/8 inches high (112 x 118 x 137mm).

With custom supports it can be made to fit on a 220x220mm build plate

I also printed the model initially at 50% scale to use with a pocket tissue holder

I sliced the STL in Prusaslicer 2.6.0-alpha6 and printed on SV06 (Klipper):

0.6mm nozzle, .4mm resolution, paint on organic supports, lightening infill at 20%.

This model was created as a mash-up of:

1.Hello Kitty Remix: https://www.printables.com/model/186415-hello-kitty-remix

2. Human Brain: https://www.printables.com/model/230891-human-brain