Inspired by Mr. Prusa himself! This Unique Flat Top printed in Rainbow filament. Since it is plastic and a non-breathable material, I created the Prusa Hexagon pattern on the back of that hat in order for your head to breath.
The file I'm including allows you to adjust the measurements as needed to fit your own head (Test Fit).
To be informed, my biggest issue was my filament had trouble extruding (under-extrusion). I would not recommend using the supports I used and have the supports at least 150% away from the model (XY Separation).
Resolution: 0.2mm+
Infil: 20%
Supports: yes
Rafts: your choice
Putting it together: pieces need to be glued. sand if necessary.
The author hasn't provided the model origin yet.