Mato, with her 9000 farads of capacitance, (translation, add about 3 pounds of weight) was leaving a trail in the carpet with her small caster wheel. Something had to be done, so I enlarged the caster base (not the bolt to frame pattern) and enlarged the caster wheel. The larger caster base file is available on this site in the files--the caster ball just needs to be printed at 155% size. The interesting thing about enlarging things in the 3d printing world, is that total size is cubed (length times 1.5, width times 1.5, height times 1.5--volume and print time more like 1.5 cubed).
Next, I charged the capacitors up to 8 volts.
With the new caster wheel, Mato takes on more of a "racing" look--back end elevated.
Here she is running around on the carpet (using 31% less energy with her larger caster wheel) and not leaving a visible trace.