Regular consumers don't really have much of a need for 3D printers...yet. IMO this is mainly due to the working materials available to budget printers. If in the future there are 3D printers that fit consumers' budgets and that can work with multiple plastics and metals, THEN I think that there will be a huge place for them. Spare and replacement part libraries will be available all over the web. Forget driving to the hardware store, just open your web browser. This also brings up the fact that current printers are probably slower than just driving to the store, so the speed will also need to increase before the standard consumer really sees the use for one.