Its E3D V6 Clone fan duct that will clip over the the cooling fins. It is for the Sunhokey Prusa i3 2015 printer. The original E3D fan ducts on thingiverse have a slightly smaller diameter for the cooling fins and as a result don't fit (find are ~25mm in diameter). Also seems to allow more flow than the previous one a downloaded as the air flow is less constricted in this model as these fans don't really make any pressure.
Printed fan side down to the bed to reduce support material with 15% infill strong and like no issues with breaking when installing on or removing. Use 3x16 mm nuts and bolts, model has nut cut outs for ease of installation.
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