GP picked a great example, because a pipe bomb is, by definition, something whose CAD parts are entirely benign. Selectively banning pipe bomb designs without banning half of manufacturing and engineering disciplines is an AGI-complete problem.

Which is hilarious right? Because anyone who can come remotely close to forging a sufficient simulacrum will not be deterred by any of this garbage legislation.

It's also plausible the secret service doesn't want to deal with the volume of idiots that might try to create fake bills if it's made easier. If stores in Idaho are getting a flood of fake bills (even if the quality is low), the secret service is going to get a call eventually. They might prefer to keep the noise volume as low as possible so they can more easily see the serious fake bill flow and have more time to focus on that.