I printed the 1405 Y axis mod from Jon Lawrence, and since I am not using an E3D hot end, I don't need active cooling. The front piece melted from the heat at the fan duct in the rear. This caused my extruder to tilt, throwing off prints. The weak point where it melted was around the rear fan duct.
I designed this piece to do two things, add extra plastic as a support for the weak point that melted, and add support to the E motor if the plastic gets too soft.