This is a roller for making brick patterns in clay. It can be scaled to any size you like. Best printed on a resin printer as FDM will not retain much of the detail at small size. I recommend printing this 30 mm tall. I printed this on an Elegoo Mars at 25 micron layer height with phrozen water washable resin. Both the STL and the OBJ are the same file. I posted the STL because someone asked for it, the file format creates bigger file sizes. This youtube video demonstrates the steps needed to make your own: https://www.youtube.com/watch?v=9KNpcrxRa_w