Printable quad-blade propeller for QX90 Ducted Frame

thingiverse

This is a printable prop for 8.5mm brushed motors, specifically designed to fit the ducted micro frame. To assemble it, simply print out four identical parts - two of each design - and insert them into your quadcopter. In my experience, these props produce significantly more thrust than traditional three-bladed designs, while also closely replicating the appearance of the Inductrix propellers. For optimal results, a fine layer resolution is recommended.