BTL history: Gen 1- 2 stack and 3 stack of 8.7" magnets. Flatwind and high xmax, cooling options. Gen 2- Single 11.25" magnet. Flatwind and high xmax coils, cooling and inductance/heat ring options Gen 3- N1: Single slab Neo magnet with integral finned heatsink. Flatwind and high xmax, cooling option 1000W low weight, lower power line N2: Dual slab Neo magnet with integral finned heatsink. Flatwind and high xmax, cooling option 2000W low weight, similar performance to Gen2 BTL line N3: Triple sl