You'll notice that you have a choice between two different sets of files. The first set contains all standard parts including the main chassis, the rotation axis, as well as the finger. The second set of files includes the same parts, but we've added some extra feet on the bottom layer to stop the models from curling. If you have a really well calibrated 3D printer or Makerbot, feel free to use the vanilla files. However, if your Makerbot is as quirky as ours, use the anti-corner curling feet variety.
Also, make sure you print one (or all) of the bases for the robot. You have a choice between a vertical screw-mounted base that you can screw onto anything, a GoPro compatible adapter to use with GoPro mounts, or a horizontal screw mounted base.