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The G3Firmware tree supports RepRap Generation 3 and MakerBot Generation 4 boards. These include:

• Generation 3:
• RepRap Motherboard v1.2
• Extruder Controller v2.3
• Generation 4:
• MakerBot Motherboard v2.2
• Extruder Controller v3.6

If you're interested in working on the code, make sure there's not someone already hacking on your particular feature! Check out our Whatcha Doin? page, and be sure to update it with a summary of what you're working so we can coordinate instead of duplicating effort.