A Wicked Lasers product has long been the closest you can get to a real-life lightsaber, but there are some Jedi weapons better left on the screen. If the tri-blade lightsaber revealed in the Star Wars: The Force Awakens teaser has caught your eye, and safety isn't your utmost concern, with the help of a 3D printer you can now make your own... kind of.
Starting with one of Wicked Lasers' Spyder III Inferno models (which the company won't actually ship to the US anymore) all you need to do is download, 3D-print, and then assemble an adaptor that uses a pair of front surface mirrors to split the beam and recreate the crossguard lightsaber seen in that teaser.
The only catch, besides the risk of blinding someone because you now have to keep track of where three intense red laser beams are pointed, is that the beams don't stop after a few feet like a lightsaber blade does. They will just go on forever, as far as the eye can see, which is a little disappointing/terrifying. But the effect is still a lot cooler than the plastic lightsaber toys you'll find at Toys"R"Us. [Wicked Lasers via Technabob]