What are the maximum number of hot end heater cartridge+thermistor pairs that can be run using RAMPS? Can the bed heating ports also be used for a cartridge+thermistor pair?

You can have 3 heaters on a Ramps. The heated bed can be used for heating a hotend. However, Ramps only supports 2 stepper drivers for extrudes natively. You would have to wire up a 3rd stepper driver to use a 3rd hotend.

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The stepper expander can expand upto three additional steppers. So can I have three additional cartridge+thermistor pairs using free pins?

Not to get too off-topic, but can you do a master/slave set-up with a RAMPS? I know you can for a Melzi, but I've never seen it done for a RAMPS.

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I have 4 extruder 4x( stepper, therm, heater) and bed. Add in aux2, aux1.

Edited 1 time(s). Last edit at 03/19/2016 02:29PM by Letaw.

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Letaw
I have 4 extruder 4x( stepper, therm, heater) and bed. Add in aux2, aux1.

What do you mean by "Add in aux2, aux1" ?

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gmh39
Not to get too off-topic, but can you do a master/slave set-up with a RAMPS? I know you can for a Melzi, but I've never seen it done for a RAMPS.

Yes you can. I use I2c in a master/slave set up. I am using a mini pro as a slave to run a set of servo's for a project I am working on.