I am curious which 3d printer manufacturers/developers are poised to take advantage of this.

What machines already have locked down (or partially locked down) slicers and communications to the boards? Have those companies made a statement?

Is there any opensource firmware which can comply?

This is a massive hit on the opensource community. As a vendor/dev of an opensource CNC control board (Smoothieboard) I will be forced to limit sales to any state with these laws (our board can easily be used to bypass these protections).

Having watched over the last 13 years how our boards have led to many other machines and innovations outside of the 3d printing community over the years (OpenPNP, Wazer, Opentrons, etc) I can only see this as stifling to development in every direction.

I wonder how companies like Machmotion and other retrofit CNC controls are viewing this as well. Since this also applies to all CNC.

I don't live in any of the states proposing these types of laws...but when it does come here I doubt it will be stopped. The simple act of making your own machine for art/design will make you a criminal.

"The more rules and regulations...the more thieves and robbers."