My concerns are, printing furniture or other non pressure bearing parts for firearm (or in my case, props and airsoft) .. wording of the private member bill in question indicates that could be covered by the bill (which may be stripped out over similiar concerns, or not be passed into law).

Being arrested for a prop because the prop designer lives in the US and , was perhaps a little to zealous with the design.

Ability to make models of firearms that feature realistic parts for education purposes (I use to do re-enactment, being able to show the public how a firearm worked was one of the things I use to do with a mock model gun .. ie a gun made in izmash's factory that was 'de-activated' at the factory, as it was never a working firing firearm it was handled differently in the UK until fairly recently and was allowed to be cut up to pre 97 de-activation rules, so parts still moved .. just the chamber plugged, barrel had two holes larger than the bullet diameter drilled into it, bolt face cut at 45 degrees, gas plug removed, etc).

Are they going to ban technical drawings of firearms next?

Most of these laws are performative, they don't actually reduce the threat. But they do end up making life harder for people not interested in becoming a criminal.