The total cost of purchased parts for the build is around 355 USD. There are some low cost printers available for the same or lower amount, but this one has bigger print surface and the joy of building it.
Great work Michael!
Here is a video of RepScrap X-Axis DC Motor and Linear Optical Encoder repurposed from an old InkJet Printer. Arduino Pro-Mini is running the DC motor, and reading the high resolution Linear Optical Encoder for positioning.
Here is a similar project from even older matrix printer parts: