The trouble is just volume and time, even just reading through the description and “proof it works” would take a few minutes, and if you’re getting 10s of these a day it can easily eat up time to find the ones worth reviewing. (and these volunteers are working in their free time after a normal work day, so wasting 15 or 30 minutes out of the volunteers one or two hours of work is throwing away a lot of time.

Plus, when volunteering is annoying the volunteers stop showing up which kills projects

People misunderstand 3d printed guns. We use mostly normal gun parts bought anywhere, but legally the pistol handle is considered the gun, and the most popular commercial ones have been plastic for decades. So 3d print that glock frame and put a glock slide on it and you’ve got a cheap glock (and outside of like 3 States, that’s totally legal).

There’s fairly large 3d printing gun communities, mostly because it’s just fun to build things.

3d printed silencers are much more rare / fragile because those are illegal to make without ATF approval and silencers need to withstand heat and pressure, so the typical plastic can’t withstand prolonged use.

I think they met either transportation or commuter