The Bending operation (for the Bend Brake process) is feasible only for a StraightBend GCD whose Min Bend Radius is not too small. The cost model variable minBendRadiusRatio specifies the minimum feasible bend radius, as a multiple of stock thickness. In starting point VPEs, the minimum feasible bend diameter is 0.5 times the stock thickness. Anything smaller is considered too small, and triggers a listing under Bend Issues in the Design to Cost tab.