TROY — The Troy engineering firm Fisher-Unitech has a fun offer for anyone interested in three-dimensional printing — schedule a free 3D printing demonstration anytime in the next 30 days and take home a practical, useful piece of 3D printing.

Namely, a case for the iPhone 4, printed straight from the Fortus 250 3D production system and the Dimension sst1200es. The interlocking gears are fully functional and will spin together.

Fisher-Unitech is a reseller of SolidWorks CAD Software, SolidWorks Enterprise PDM and the Dimension 3D Printer with 14 branch offices serving Michigan, Ohio, Pennsylvania, Kentucky, Indiana, Illinois, Wisconsin, Missouri, Massachusetts, New Hampshire, Rhode Island, Connecticut, and Kansas.