Within the Da Vinci 1.0 extruder is a small PCB. It serves a few functions and was pretty straight forward to trace out the circuitry to create a schematic.
The Da Vinci 1.0 has a small NTC thermistor embedded in the extruder. This provides the printer with temperature measurements of the extruder.
After some experimenting, the extruder’s thermistor temperature response curve has been inferred through substituting known values of resistance for the thermistor. All the measured values have been compiled.
The small quick release connector for the extruder heater recently failed. This was discovered half way through a print when the extruder stopped heating.
Initial thoughts were that there was a software bug due to the extruder failing to extrude filament after 12 hours of continuous operation. However, some fiddling with connections revealed that the plug and socket connection was the culprit.
Replacing the stock connector with something more robust is straightforward but the process is a little fiddly.