Here's another shot at creating a textured rolling pin (this time regular castle wall stonework) for making walls for your scenic (28mm) terrain.
The model is 6 inches wide. One turn should theoretically give you a 6"x6" textured area.
It is based on a seamless (in both x & y directions) texture, so if you line it up correctly (put a mark on the side of the roller) it should produce a seamless pattern on your surface.
If you don't have a suitable paint roller handle, try using a screwdriver for the axis.
For foam you need quite high pressure to get a good pattern. Another standard medium is air-dry polymer clay on MDF or plastic card. Let the clay dry for 10mins then use the roller. Use an old toothbrush to keep it clean.
I print at 0.1mm to get best texture results, but your call!
Good luck and show off your results!
PS Any tips for beer are welcomed now I'm retired!