Mark One Dev Kits?

[fabhappy]

The differences are outlined at the bottom of their home page:

The Mark One ships with:

• Mark One 3D Printer
• MarkForged software
• Carbon fiber filament sample, 100 cm³ (6.1 in³)
• Fiberglass filament sample, 150 cm³ (9.2 in³)
• Nylon filament, 1000 cm³ (61 in³)
• PLA filament, 1000 cm³ (61 in³)
• 2 x CFF Quick-change nozzle
• 2 x FFF Quick-change nozzle

The Developer Kit includes:

• Mark One 3D Printer. Earliest ship date*.
• MarkForged software. Premium software support.
• Kevlar® filament, 300 cm³ (18.3 in³)
• Carbon fiber filament, 200 cm³ (12.2 in³)
• Fiberglass filament, 300 cm³ (18.3 in³)
• Nylon filament, 2000 cm³ (122 in³)
• PLA filament, 2000 cm³ (122 in³)
• 5 x CFF Quick-change nozzle
• 5 x FFF Quick-change nozzle
• 2 additional print beds