Lasercut chipboard to cover the bottom of cells in an old letterpress type case—testing measurements are right. (Already vacuumed w/special attachment hose & rotating brush, powerwashing, wiping; this is just for the ones that are still looking very questionable).
Also had a real #DHtries where I engraved a friend's research project logo on a round wood plaque. Backwards (horizontally reflected, whoops), because I'm used to doing that for printing blocks (may still work as one but that wasn't the intent)