Can’t afford your own 3-D printer? Just head to the UPS Store. UPS announced plans Monday to bring in-store 3-D-printing services to nearly 100 stores across the country, billing itself as the first national retailer to do so. With the UPS system, customers can submit their own designs for objects like product prototypes, engineering parts and architectural models that are then printed on a professional-quality 3-D printer made by Stratasys. Prices vary depending on the complexity of the object; an iPhone case would be about $60, while a replica femur bone would be around $325. UPS can also connect customers with outside professionals who charge an hourly rate to help produce a design file for the printer. It generally takes about four or five hours to print a simple object, with more complex items taking a day or more.