Geeetech i3 Electronics Cover

SummaryI wanted to fix a few issues with the original design plus add the possibility to use a 120mm fan.Once I was there I also added a few more vents and an additional cable exit for the bed heater.WARNINGI haven't tested the 120mm designs yet, so feedback is welcome.UPDATEAfter receiving some feedback via comments here I've added two additional models for the 120mm fan using a classic air vent design: the honeycomb grid seems to increase the fan noise sensibly.UPDATEAfter some more feedback I've added a revision B which reduces the grid fins on 120mm format but, most importantly, also adds captive nut slots so that threaded inserts are no longer required: you can now choose to use an M3 nut or use a threaded insert.In addition, in revision B the 60mm fan position has been moved, to reduce interference with cables running inside the box, and a 40mm version has been added for those willing to use the stock fan.To recap:classic version has been reported being noisy and does