I've done a respin of the Gen7-AVR1.5 CCA to support dual extrusion in a convenient form factor. The main point behind it was to line up all of the drivers nicely and be able to attach a heat sink + fan on some nearby guide posts.
You can see a picture of the new layout here.
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www.ubc-rapid.com]
Linking up the heater MOSFET and thermistor to the uC was fairly awkward, and does require 2 flywires, but it was done this way so as to not render any extension boards useless. If I was doing it just for internal use, I would have respun the entire thing, (probably with SM components), with a focus around thermal management of MOSFETS and drivers, but, thems the ropes, as they say. Switching between extension boards and dual extruder support is just a matter of 4 jumpers, so I figured that a good way to go.
The source files can be found here:
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github.com]
Edited 5 time(s). Last edit at 01/14/2014 05:52PM by SteveNovakov.