Hello,
I would advise against 3D printing anyway. I don't know where you're from, but there are very good kit manufacturers in the UK (Troopermaster, RS-Props, RWA-Creations), and I highly recommend them. It also depends on your requirements – should it be as accurate as possible? Then RS & Troopermaster. Should it be good and affordable? Then RWA. Should it be affordable and troop-ready? Then DA-Props from France. In Germany, there's Ironmotion, which is also very good.
You can find all the ones I mentioned on Facebook. Unfortunately, I don't know what manufacturers there are in the US. Try talking to a member of your local garrison about where they got their kits. You'll probably get some help there, too.