CR 10S Pro - Reworked OEM Cooling Fan Duct

thingiverse

I experienced a problem with prints getting random layer shifts (see picture of failed owl print) and after quite a bit of investigation and trials found that the cause was the poor fan duct that was originally supplied. What had happened was that the silicon hotend cover was pressing on the fan duct and with the higher temps of PETG, the fan duct had begun to soften and distort and then was catching on the top of my prints causing the layer shifts ! The fan cover is really poor and Creality should not supply a printer of this price with this problem. I down loaded the OEM fan duct and reworked it to get the required clearance to the hotend cover and rotated and shifted the duct outlet slightly to get the air more central to the nozzle tip. See pictures to illistrate. I printed this replacement duct in PETG for the higher temp resistance. I hope that this can help others :) The supplied gcode file is for PETG and is sliced in CURA for a CR10S Pro. I will supply the fusion360 file if asked.