Mega Zero shorter ring cooling duct upgrade (MK8 compatible)

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4811910.

This is nearly identical to the original https://www.thingiverse.com/thing:4631288 except the "middle" section between the fan and the flat bottom area has been reduced in height to 80% to accommodate the slightly shorter Creality Ender compatible MK8 style hot end.

If you have clearance issues between the printed duct and the corner of the metal fan shroud on your printer, you can briefly heat that area of the printed part with a lighter, and then press it up flush in place and it will form-fit that extra half mm or so if required to get things 'flush' for a perfectly level alignment.

Update 4/29/21, A second version of the duct with a different mounting attachment has been created. This version will properly attach onto the Creality branded 24v Ender-3 fans as well. As the mounting attachment is less sturdy, there's also now a third hanger eyelet on the right side of the duct to provide a paperclip tie off point to keep it from drooping out of level. The original v1 duct with the stock mounting for the stock 12v AMZ1 fans is still available for download if you prefer that version.

The FreeCAD project will be available from my github, but it's apparently over the Thingiverse size limit.