We planned for a 50-drive batch, machined in aluminum. That manufacturing process was particularly beneficial in 2 ways compared to 3D-printing in stainless steel:
(1) Cost reduction. We can deliver fully assembled drives for less than the cost of printing the parts yourself.
(2) Weight reduction. The aluminum R2Drive weighs only 0.47 g, half as much as the stainless steel version. Lighter implant, happier animals!
Given that, it makes sense that all 50 drives were claimed in under 24h! We are now planning to ship the first 50 and arranging a 2nd production run so that everyone who preordered gets their drives no later than July-August. The first orders will ship in June.