First off, you need to check with laws before you do anything. Duh. Suppressors and SBRs are in flux as you know but check first. I'm in Ga and we still have a state law that requires registration for a suppressor. Boo. Guns obviously need ATF blessing.

Still cool to look at. I'd like to 3D print a 22lr suppressor. Gotta buy some high temp carbon fiber filament and probably wait for the laws to clear.

https://defcad.com/library

They even have some Ukrainian drone bomblet designs. (Cool to look at-If you make that you're a moron).

P90 will never not be the coolest gun ever.

Also there is a push now for the government to monitor what you 3D print. I think California is doing this.

From the website:

State and Commerce Department regulations restrict 3D file transfers of receivers and assemblies to "U.S. persons". U.S. states like New Jersey and California further restrict access to 3D2A files to residents with an FFL. DEFCAD enforces standard security and access controls to allow for the legal publication and transfer of GunCAD files while we fight these authorities' restrictions in court.
DEFCAD will never ask for your SSN