This simple base can be printed fairly quickly, although I recommend printing it solid, so there is no holes. I also recommend printing it with the top down, as the model is oriented, as to get the best results. 

The base has a diameter of 25mm and is 3mm thick, although it can easily be scaled to make it a bigger base for larger models. In the photo, the smallest one is 100% scale, then 125% and 150% respectively. note: I recommend scaling it only in the x and y axis if you are scaling it up fit a larger model, as scaling it in the z axis will probably make it thicker than you want.