Vibration reducing corner pieces for (feet) rigidbot.

There are a few other ones on here for the rigidbot but I wanted to tweak them a little. I liked the one that went into the corner peices. The mod I did was to create a lip on the bottom to help keep the pads centered. Additionally because I have the rigidbot big it is heavier so I had to buy the "acoustifeet" ACF3007-25B which were slightly larger than the bottom of the original design but can handle weights up to 48.5 lbs (22kg). Just because all the weight I would recommend a 30% infill.