I saw a media report on the website; www.myfoxorlando.com
about 3D digital images & machines that could in the near future, use CAD/lasers to create polymer weapons.
There are a lot of issues to work out; ammunition, engineering, R&D, etc.
The reporter did bring up the slick polymer firearm actor John Malkovich uses against Clint Eastwood's tough guy US Secret Service agent in the 1993 action thriller; In The Line of Fire, www.imfdb.org
It's a interesting concept but its still decades away.