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I think I have two board designs floating around. Either will work for either application. One does not have a crystal, because I found the internal osc. to work more reliably. The firmware code does not use the crystal. The big difference is the 3D printed case. The one on Hugh's site is for the filament extruder and the one here is for a 3D printer. Board dimensions are exactly the same so either will fit in either case.