@kenshirriff Incredible stuff! Please keep us posted on your progress!

Did that type of print head/drum work by rotating to present a facet with the desired symbol in the desired place then transferring it to paper via a ribbon and hammer? If so, that is wild.

NASA must've decided it was worth the weight budget to ship up this incredibly device. The frame looks like cast iron! I bet the symbol drum weighs a few kilograms by itself.