The idea is for the design to be repairable and the plans available. These can specify materials as well as shapes etc. Basically, if it needs to be specified t

The idea is for the design to be repairable and the plans available. These can specify materials as well as shapes etc. Basically, if it needs to be specified to meet a level of performance, it can be so specified. In terms of mass sales, yes a manufacturer would have to make it. But multiple manufacturers could and they may not "cheap out for obsolescence sake" in the same way. And if they do, a person has the option to make it themselves - whether or not it makes economic sense. This is still better than the current situation where the customer has to pay money, cross fingers and hope.