Thanks for the clarification :) I've decided to upgrade to a potentially nicer solution, also because I've been patching this one up every now and then (3 arduinos later..). I suspect the connector failed because at the time of connection I didn't know crimping was necessary.

Well the board is broken, so i want to upgrade that. The rest of the machine is a continuous work in progress that'll keep going :)

Great episode! As someone living in Berlin, it's fun to hear about the local landmarks (and your pronunciation of German made it so much better).

Another building with fun 'weird ww2 architecture' history is the main one of the Tempelhof Airport. So many odd decisions! (Column girth being one)

Please also read the discussion in the comment section on this article. It looks like virtually any "3d printed gun" has existing plastic pieces (which contain the serial number) replaced by printed parts; you need a 'regular gun' worth of components to "3D print a gun".