For every constraint I see them creating in the law, I can instantly create a simple workaround, and also see multiple ways it will impair or destroy the ability to create 100% legitimate parts/components/products.
This is an unfortunate example of a too-common political solution:
A new industry arises that unintentionally creates a new capability that some can use to create problems.
So, "let's just create a mandate on the industry that will destroy it or contort it beyond recognition, and provide no funding to support this new requirement!".
I fully understand and fundamentally support the need for government to regulate markets, pollution, product & food safety, and much more, but this simplistic approach is a net negative for society and the economy.
They need to focus on the actual act of "3D printing firearms" not on the precursors.