CTC-3D Stepper Fan Duct

I set out to replace the mainboard fan in my CTC-3D printer due to the loud noise it was making recently, and found that the fixating screws were a bit wobbly, so I decided to design this part, which fits into an existing, unused 20mm diameter hole on the plywood frame piece close to the fan.

EDIT:
Added a thicker version of the same model, as one of the grapples snapped while fiddling with it. Also printed the new version using TPE filament, will install it as soon as possible and see how t