Torx T30 screw bit

What for would I need a 3D printed T30 Torx bit?

You may have found my set of 3D printing optimized set of screws and nut already. This contains a set of Torx head screws as well. https://www.printables.com/model/1124580

But I don't have a screw driver for screw bits…

Be my guest and get your printable bit screw driver here: https://www.printables.com/model/493064

With it's slim appearance the screw driver will prevent you from over-torquing the printed screws or the screw bit. Apparently, 3D prints are not as strong as metal parts.