Hey Im trying to do this exact same thing.
Im using a ramps 1.4 board right now with marlin. Ramps has D8 D9 and D10 outputs. D8 is extruder 1 D10 is heatbed and D9 should be extruder 2 but will switch a relay going to a heat gun inside the box housing my printer.
Is there any way to add additional temp controllers in Marlin? Seems like there must be since Rambo boards have 4 thermister inputs built in. How can these thermister inputs be used??
thanks for any advice!
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r4ix 0
I think i should post this topic in Marlin thread. Any moderator can change it?
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