Lego Base for D&D
by clahey, published
This base is meant to be used with a Lego mini-fig to match the scale of 1 inch wide base miniatures.
The scad file has a number of useful variables including knobdiam and crossbars. I've included stl files with crossbars set to either 0 or 2. 4.85 mm knobdiam is working well in the prints I've got, but if your printer is different, having this variable might help.