I have not performed any cleanup on the block, I just primed them. The pallet did take some cleanup to make it anywhere near reasonable.
There were some strings hanging down that needed filed off, then a little sanding on the faces. The pallet was painted with craft paints.
I changed my design since I printed this one, and there is less stringing now, but still one or two at each board, as I am printing this without any support, and few strings will sag. A touch with the hobby knife, and they are gone.
A little sanding on the faces of the blocks would help them, but I wanted to show what they look like right out of the printer.
The extreme close up shows all the flaws. And since I don't model in O scale, I don't have any use for them anyway.
I have done barrels, both wood and steel in O scale, http://nvrr49.blogspot.com/2014/06/barrels-wood-and-steel-ho-s-and-o-scale.html