3DPrinting
3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.
The r/functionalprint community is now located at: [email protected] or [email protected]
There are CAD communities available at: [email protected] or [email protected]
Rules
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No bigotry - including racism, sexism, ableism, homophobia, transphobia, or xenophobia. Code of Conduct.
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Be respectful, especially when disagreeing. Everyone should feel welcome here.
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No porn (NSFW prints are acceptable but must be marked NSFW)
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No Ads / Spamming / Guerrilla Marketing
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Do not create links to reddit
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If you see an issue please flag it
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No guns
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No injury gore posts
If you need an easy way to host pictures, https://catbox.moe may be an option. Be ethical about what you post and donate if you are able or use this a lot. It is just an individual hosting content, not a company. The image embedding syntax for Lemmy is 
Moderation policy: Light, mostly invisible
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Untraceable for what?
Almost all of them still use metal parts that can be x-rayed and still have barrels that leave ballistic fingerprints on bullets. Serial numbers don't make something GPS-tracked.
Untraceable in terms of ownership? There is no national firearm registry. Guns bought from FFLs require a NICS background check that is stored in an ATF database (of questionable legality), but private sale guns often don't require NICS so the database isn't an accurate registry of gun ownership.
And criminals scratch off serial numbers anyways.
And add on that any laws requiring serialization of privately-made firearms are only affecting nerds, not criminals. Criminals that are making guns because they can't pass a NICS background check will continue not adding serial numbers - because they're criminals.
NICS checks are not stored. Or at least they're not supposed to be. The firearms info is collected on a form 4473 in paper and kept at the FFL where the firearm is purchased.
But the ATF has been caught several times collecting these records and digitizing them in an attempt to create a registry.