Confused about 3-D printing? You won’t be after creating an object at the iMakr print shop on the Lower East Side. The shop has a factory-at-home feel where people will be comfortable testing the new printers, which cost iup to $2,000. More affordable options include a 3-D–printer pen (which basically makes three-dimensional doodles) for only $99. You can learn the design ropes via the two-hour workshops at the store every week. (Download free software at myminifactory.com prior to bringing your laptop to the class.) On-demand printing is $10 per piece and $10 per hour. (Smaller items usually end up costing around 50 and under.)