My Opinion on Printing Firearms
There are entire communities focused on printing firearms.
I have seen some awesome builds; however, my experience is that it is not worth it.
The gun part kits for 3D printed firearms are over $300 dollars.
AR-15 stripped lower receivers are $30 with FFL fee about ~$80.
A complete lower parts kit is under $100.
Complete uppers start at $250.
So $450 gets you an all metal rifle good for 20 thousand rounds if maintained.
There are awesome budget pistols under $300 by major firearm companies with reputations for quality.
You will spend a huge amount of time making something that will fail.
If you want to make firearms consider 80% lowers and desktop CNC machines.
Nothing beats metal.
My advice is to focus on printing bows, crossbows, and slingshot devices instead of firearms.
It gives you the flexibility to design, create, and share your builds without any potential legal issues.
Reusable projectiles is fantastic.
I design alot of AR-15 related accessories like flashlight mounts and wall mounts.
It saves me alot of money without scarificing weapon dependability.