MakerBot Button Bot Assembly Instructions And Parts List page 12

Insert the 9 arcade buttons through the holes in the head and screw the backings onto them.
For the 8 buttons around the edges, the switch clips shoud be oriented so that the tall side of
the clip is facing the center. The center button's clip should be oriented so it fits between two
of the outside button's clips. Refer to the wiring schematic in the appendix for connecting
the buttons.
Adam Fontenault and Todd Blatt - Makerbot Studio - Spring 2012