I made this design back in 2021, because of the long-awaited James Webb space telescope launch. The whole design has a diameter of about 38 centimeters, but it can be printed in smaller pieces, so that it can fit on smaller printers.
To assemble it you will need 18 mirrors with dimensions of 80x70x40mm.
Those should fit fine https://pl.aliexpress.com/item/1005002967041470.html

Here is my video explaining the process of making this wall art: