I've designed everything to be printed at low resolution for speed of printing and without support, if you want to print the surfaces out at a higher resolution then there is a lot of detail in the files. Scale them up to fit your printer, I've printed them at 150 mm square, which seems a nice modular size. The tiles fit together quite tightly, so clean up any edges for a good fit. If your covering the surface with grass flock, then it will cover up the low resolution print and look great. If you have scenic elements above the grass, rocks or road etc, then a coating of plastic glue is one way to smooth off the layers on the print, but for rocks this can also look great as strata in the rocks!