[JesseK]

Last year we used two open-ended belts, cut and mated together. The belt that went over the top of the carriage interfaced to a flat pulley via the flat side of the belt (i.e. teeth out). The belt that went around the motor at the bottom had the teeth in. The two belts connected to each other on the carriage via two knurled clamping plates. At the other end of the two belts, we mated the inside teeth to the outside teeth with about 3" of overlap. We then used safety wire and high-strength (15-mil) duct tape to keep the two sides of the belt together. It worked pretty well, and only needed maintenance once.