The MakerBot Thing-O-Matic source code and schematics are inconvenient to find. Much of the original material on Makerbot has been archived. RepRap has links to much of the material, but several links are stale. What follows are links to the board schematics and firmware source code. MakerBot did sell other versions of the boards, but these are the ones I've worked with.

General items

• Communication protocol
• RepRap: Generation 4 electronics

Interface 1.0 (1.1?)

• Electronics
  
  • Reprap entry (most links are broken)
  • Schematics and PCB layout

Mechanical stops 1.2

• Electronics
  
  • RepRap entry
  • Schematics and PCB layouts

Stepper 3.3

• Electronics
  
  • RepRap entry
  • Thingiverse entry
  • Schematics and PCB layouts

Extruder 3.6

• Electronics
  
  • RepRap entry
  • Rep entry for 2.2 has working images
  • Thingiverse entry
  • Schematics and PCB layouts
• Firmware
  
  • See Sailfish motherboard firmware below, follow the path: Sailfish-G3Firmware / firmware / src / Extruder /

Motherboard 2.4

• RepRap entry
• Electronics
  
  • RepRap: Gen4 Electronics
  • Schematics and PCB layouts
  • Thingiverse entry
  • RepRap: Gen4 Electronics
• Firmware (Sailfish)
  
  • RepRap entry
  • Thingiverse entry
  • Github source code
  • Github source code
  • Github source code
  • MakerBot entry

MightyBoard
The Replicator followup to the Thing-O-Matic combined all the individual boards to one called the MightyBoard. The designer of this board has an interesting page including some history and several links, including an EEVBlog review, for the MightyBoard.

Sources for project inspiration

• RepRap: Vaporware electronics
• RepRap: Future plans
• RepRap: Future tool ideas
• RepRap: Firmware wishlist
• RepRap: other electronics
• RepRap: Ideas to place