This is a stylized "landing pad" stand for AntsinAfrica's wonderful Falcon 9 Model ( https://www.thingiverse.com/thing:2914233 ). Sized 210mm x 210mm.
Thanks to blackbearnh ( https://www.thingiverse.com/blackbearnh/designs ) for the idea and initial model I remixed this from.
The author marked this model as their own original creation.