I 3D print quite a few parts and tools, here are the files for some of them if you want to print them yourself at home. I mostly use PAHT-CF material.
Disclaimer: All files are provided as-is, I’m not responsible for how (or if) they work for you.
Brompton Bottle Boss Jigs – a couple of jigs to mark holes for bottle bosses on Brompton frames and stems, designed to work with automatic centre punches. The stem one needs a little bend in it.