A 50mm square base with a rough surface texture, for tabletop gaming.

(Sample print was done with an XYZPrinting Mini W+. Please post photos and comments if you print one off for yourselves using a better printer.)

(The little circles at the corners of the second version are supposed to help with adhesion to the base plate and to keep the corners from curling up. As you can see from my sample print it didn't really work for me, but maybe it'll work for you. Just snip them off when the part is finished printing.)