Well, I did not just buy the cable, because it was not available anywhere when I looked. Instead I bought a 3D-printer, taught myself CAD, designed the housing parts, sourced a step down converter and a cable with matching connector (which also was hard to come by) and some other small parts, made sample prints and so on until I finally had the thing ready. So overall lots of work and investment.
I mean, I was interested in 3D-printing before that, but that AXS-cable was what made me actually get into it....