I print bases of various types. I have the whole range of WRG standard bases, GW style, Bolt Action, FoW, just about anything. I did the math and the amount of filament used is cheaper than buying them. So whenever I get to the end of a roll of filament I use the rest to print off bases and throw them in the storage bin. If you look on Thingiverse you can find several customizable files to print bases with slots, sloped sides, ovals, etc.