The cost of 3-D printing has long kept the technology in a select few hands, but all that is changing as 3-D printing blossoms into a full-fledged trend.

This June, Staples will start retailing a consumer 3-D printer, the Cube 3D Printer, for $1,299 — not cheap, but not out of reach of the dedicated techie, either. Proponents hope that as costs come down, more sophisticated printers will reach the general public, allowing for digital DIY manufacturing.

Though copyright and quality issues remain a concern, 3-D printing has already made its mark in some pretty weird ways. Read on for seven strange objects created by 3-D printers.

1.  A working gun

It looks more like a toy than a deadly weapon, but the world's first 3-D-printed gun has gun control advocates as well as pro-gun rights enthusiasts concerned and excited. Last year, Cody Wilson, a radical libertarian/anarchist from the University of Texas' law school, announced plans for printing a gun, establishing a nonprofit called Defense Distributed to fabricate the weapon and distribute the plans.

In early March, Wilson and his team achieved their dream, successfully testing the "Liberator" on a Texas firing range. Except for a firing pin made from a metal nail, the gun is made from plastic pieces printed on an $8,000 Stratasys Dimension SST 3-D printer. The gun successfully shot a .380 caliber bullet, but exploded when its creators tried to modify it to shoot a larger 5.7x28 rifle cartridge.

2. A make-it-yourself violin

The world's first 3-D-printed violin is half technological wonder, half papier-mâché project. DIY violin-maker Alex Davies used 3-D printing to make a plastic form for the violin's body, which he and his team then covered in newspaper and glue. A piece of cardboard made the neck and some picture-hanging wire served for strings. The result, announced online Feb. 27 via a somewhat-difficult-to-listen-to YouTube video, was no Stradivarius, but its creators declared it "not bad for a weekend and 12 dollars."

3. A dead king's face

After discovering the skeleton of long-lost King Richard III under a parking lot in Leicester, England, archaeologists turned over the skull measurements to facial reconstruction expert Caroline Wilkinson of the University of Dundee. Wilkinson and her colleagues sculpted computerized flesh to computerized bone and then 3-D printed the resulting bust — a lifelike look at a man dead more than 500 years.

4. Human stem cells

Don't expect to see this in Staples anytime soon, but scientists have developed a 3-D printer for stem cells. [7 Cool Medical Uses for 3-D Printing]

The device works by creating uniform droplets of living embryonic stem cells, which are the cells present in early development that are capable of differentiating into any type of tissue. The printer is so gentle that it can squirt out as few as five cells at a time without damaging them. Researchers can use the dabs of cells to rapidly test drugs or to build miniature scraps of tissue. The eventual goal is to grow whole organs from scratch.

5. Most of a skull

3-D-printed organs may be a dream for the future, but scientists can already build some body parts. In March, surgeons replaced 75 percent of a man's skull with a plastic one made by 3-D printing.

Replacing damaged or diseased bone is not new, but the OsteoFab implant is the first to be custom manufactured via 3D printing — an advance that helps bring down the cost. Oxford Performance Materials, the company that created the implant, plans to work on other biocompatible implants for the rest of the body.

6. A bionic ear

Did you hear that? Probably, if you're wearing a 3D-printed ear created by Princeton University researchers. The bionic ear, made from calf cells, a polymer gel and silver nanoparticles, can pick up radio signals beyond the range of human hearing.

To make the ear, the researchers printed the gel into an approximate ear shape and cultured the calf cells on that matrix to create something appropriately biological. An infusion of silver nanoparticles creates an "antenna" for picking up those radio signals, which could then be transferred to the cochlea, the part of the ear that translates sound into brain signals. However, the researchers have no plans to stick the ear to a human head. Yet.

7. Your very own fetus

Can't wait to see what your baby will look like? Japanese company Fasotec has you covered. The engineering firm can take magnetic resonance images (MRI) of a developing fetus in the womb and convert them into a 3-D-printed paperweight of your fetus in white plastic, surrounded by a clear plastic tummy.

Fasotec's main gig is creating 3-D prints of scanned organs for doctors and medical students, so fetus keepsakes are something of a promotional sideline. Japanese moms can get theirs for about 100,000 yen (approximately $975), not including the cost of the MRI.

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