Yet another Menger sponge
thingiverse
Sorry I could not resist -- the algorithm is too beautiful. It scales with 3^3^iter ;-) Have a look at the scad file. If you forgot what a Menger sponge is, have a look at the [Wikipedia article](https://en.wikipedia.org/wiki/Menger_sponge). I choose the parameters in such a way, that the smallest detail is a multiple of the nozzle diameter. Be careful with iterations above three (3). Using four (4) took me 1h to render, the file size is 100Mb and it prints 1d7h. Five iterations will be 27h and 2.7Gb, etc..
With this file you will be able to print Yet another Menger sponge with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Yet another Menger sponge.