Einstein’s Workshop — a family-friendly STEM center in Burlington — will hold a free 3D Printerfest on Saturday, September 6, 1-5PM at 25 Adams Street in Burlington.  There will be demonstrations of multiple types of 3D printers and workshops for making 3D-printable objects.  Inventors, educators, and vendors of 3D printers are invited to exhibit.  Call 781-202-5645 for information.