WA HB 2321 and unintended impacts on 3D printing / STEM learning

First, I’ll out myself: I’m a Bellevue resident (formerly U District).

I’m also a parent and hobbyist, and I wanted to flag a WA bill (HB 2321) that’s been getting less attention than I expected—especially given the local tech community and the number of used 3D printers I see on places like Facebook Marketplace.

HB 2321 would require any 3D printer sold or transferred for payment in Washington after July 1, 2027 to include software “blocking features” intended to prevent printing certain firearm-related designs. That includes used printers sold between individuals, not just new ones.

The goal is public safety, which I understand and don’t oppose. What worries me is the side effect: to make this work, printers would likely have to accept files only from approved or “authenticated” software. In practice, that means locking down the software side of machines that are currently very open.

That would close off a lot of experimentation—especially with open-source tools people use to learn how these machines actually work.

In our house, 3D printing started with toys and gifts and turned into real interest in engineering: how materials behave, how designs fail, and how software controls hardware. That kind of tinkering depends on being able to modify tools, not just push buttons.

I’m struggling to see how this kind of restriction meaningfully stops bad actors (who already have easier options), while it does make hands-on learning and maker-style exploration harder for regular people, schools, and hobbyists.

I’m genuinely curious how others see this—especially folks involved in education, manufacturing, or the local maker community. Are there ways to address safety concerns without locking down general-purpose tools?