Now you can use a 30mm fan for the motor. Compatible with any battery strap. It is recommended a JConcepts Finnisher body for clearance. With other bodies you may need some trimming. M3x8 screws are used to fasten it to the gearbox, as the original ones (M3x6) are too short. A standard fan (10mm) or a low profile fan (7mm) can be used.