SLUM

SLUM or "Sanguinololu Upgrade Module" is an add-on board for the [Sanguinololu] control board. SLUM allows the Sanguinololu to control an additional extruder motor, hot end and thermistor, as well as a controllable cooling fan. It is designed to allow signal pass-through for devices which use the pins on the SPI connector and/or the TX/RX pins of the expansion header such as [SWA] and [SLSD].

The stepper motor control is provided by a pluggable [Pololu_stepper_driver_board] which runs on the same 12v source as the Sanguinololu board. The thermistor and hot end driver circuits are both derived from those on the Sanguinololu, allowing for consistent behavior. The cooling fan and hot end are both driven by power MOSFET transistors, with an optional small signal transistor for cooling fan PWM speed control when a compatible fan is used.

As of the time of this writing there is currently no firmware which will take advantage of SLUM, however efforts are underway to make a configuration section in Marlin firmware to take advantage of the dual extruder and cooling fan feature.