Digging into or otherwise dissolving (with hot sulfuric acid) ancient microchips.
Amazing work guys! So sharp and detailed you'd swear someone was holding a 50-inch version of the die in front of you.I'm really looking forward to when you finally reveal the Z80.
Thanks Kev! The Z80 is on it's way, slightly delayed by all the amazing donations we've received. The metal layer is vectorized, and hopefully other folks will contribute to the lower layers.