First fully 3D printed gun now exists

[Seth]

Surely a crossbow would be a better idea if you want to 3d print a weapon on the quiet. No pissing around leaving a paper trail buying ammo

Perhaps the materials are too rigid and brittle (as of yet) to make effective springs, etc.

Not adequately concealable. Besides, you can go buy one of those at the sporting goods store for cash and leave no paper trail.

[piscator]

Surely a crossbow would be a better idea if you want to 3d print a weapon on the quiet. No pissing around leaving a paper trail buying ammo

The primary advantage of a crossbow over a bow is that you can take a rested shot. A bow flings a heavier projectile faster and reloads quicker, and ultimately has longer range due to the higher mass hence momentum of a longer arrow vs a crossbow bolt.
Both are made with modern composite materials to tight tolerances these days. It would take a lot of work to print a modern compound bow.

http://mathewsinc.com/products/bows/

[FBM]

Surely a crossbow would be a better idea if you want to 3d print a weapon on the quiet. No pissing around leaving a paper trail buying ammo

Perhaps the materials are too rigid and brittle (as of yet) to make effective springs, etc.

I think so. I thought I heard the guy in the vid say that they had to use non-printed springs.