I was fed up with the subpar cooling that comes on the Mingda D3 Pro stock so I made my own for dual 5015 blowers. The hot end duct is a rather old design when I was first learning lofting on Fusion 360 and as such I plan to redesign it in the future. This design allows you to use the bed level sensor in it's original location if your printer is so equipped. This system requires the removal of the stock part cooling fan and replace it with dual 5015 blowers wired in parallel, as well as removing the metal cover and hot end air diverter. I've printed these in Esun PLA+ and even though the fitment is tight i have not had any issues with any parts melting while printing PLA. I would however recommend a different filament if you print anything requiring higher temps.

Mingda direct drive dual 5015 blower fan cooling

Mingda DD Dual 5015 Ducts.stl

Mingda DD Fan Mount.stl

Mingda DD Hotend Duct.stl

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Mingda direct drive dual 5015 blower fan cooling

Mingda DD Fan Mount.stl

Mingda DD Dual 5015 Ducts.stl

Mingda DD Hotend Duct.stl