Giant Lite Brite v1.0 (not shown in this Instructable) was field tested at Yuri's Night
at the Nasa Aims Research Center in California It fared pretty well there where it got steady use, but only for one day, and by only a couple hundred people. By the end of the event some of the foam (only v2.0 used rubber) was coming away from the acrylic front and so some slight modifications were made in order to improve performance for the Maker Faire.
Before the Maker Faire
, Mitch and I added on some small nuts, bolts and wide washers to mechanically hold the rubber in place. This was done before the event right outside the exhibit hall in a moment of haste and didn't really do much to help the rubber stay in place since it was so elastic. I can't recommend this as a solid method for holding the rubber in place, but at the time, it was all we could do.
Although the Lite Brite provided hours of fun entertainment for people attending the fair, its rubber backing suffered quite a bit from all the use and came completely off in many spots.
Plans are in the works to waterjet a permanent solution: a steel sheet bolted directly behind the santoprene that holds all the sheets of rubber in place. The sheet will be thin gauge steel that is cut using the same file that the front panel of acrylic was cut with. Except for one change - the steel rubber backing plate will have just a slightly larger hole diameter then the black acrylic to allow for the santoprene tabs to fold back easily when a peg is pushed through.
Updates to this Instructable will follow once the sheet is fabricated.