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Added dual extruder variant of Gen7 board #15

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scottlawsonbc
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Added UBC Rapid's variant of the Gen7 board. This variant is the same as the original Gen7-AVR 1.5 board except for the following modifications:

-> Added an additional stepper motor driver which can be used for dual extrusion or other purposes. This board variant supports a total of five integrated stepper motors. Unlike the Gen7 stepper driver expansion board, the fifth stepper driver is connected to existing power rails and does not require an additional disk power connector.

-> Mounting holes around the stepper motor drivers for optional mounting of a
large heatsink or fan.

This board is designed for those who know ahead of time that they would like five stepper drivers.

Added UBC Rapid's variant of the Gen7 board. The main changes are:
-> Five integrated stepper motors for dual extrusion or other purposes.
-> Mounting holes around the stepper motors for optional mounting of a
large heatsink or fan
@DoWhileGeek
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Now correct me if I'm wrong, but shouldn't there be consessions made for an extra thermistor and heating element?

@scottlawsonbc
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Good catch! I uploaded the wrong files by mistake, the correct files include the corresponding stepper motor and thermistor inputs. I will sort it out as soon as I can get a chance.

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