This is a randomized fractal (recursive) snowflake implemented in BlocksCAD.
To keep symmetry, I used a simple seeded pseudo-random number generator rather than the built-in generator (though you can set the seed to -1, and then it'll be seeded from the built-in generator, so you'll get different output each time).
The Thingiverse customizer was made by exporting from BlocksCAD to OpenSCAD and moving the variable definitions to the top of the file.
I am attaching an image showing seeds 1-100 so you can choose which one you like. There are many more seeds available, of course (up to around 4 billion).
The BlocksCAD project page is here: https://www.blockscad3d.com/community/projects/68072
For printing, I recommend increasing retraction to minimize whiskers, and then begining the removal from the bed with a razor.