These are top plates with shark fins for the RC Crazed 4" Slim Phast drone. If you use this in addition to your original top plate, it should be pretty tough. A similar shark fin that is available for purchase has a shark fin that is about 44mm tall. Unfortunately, I've seen it break a couple of times. The "short" one here is about 20mm tall. The "medium" one is about 30mm tall. They should be tall enough to give the quad a chance to be able to flip over using turtle mode when it lands upside down. These do not have an EXACT fit to the top plate, but they are real close.
The orange fin in the pics is an original from rccrazed.com. In the pics, the black one is PLA and the orange is TPU. PLA would be really stiff. On the short one, the fin is short enough that the PLA could most likely withstand crashes, but I think TPU would be the better filament to use.
The center screw hole spacing is 30mm side-to-side and 40mm front-to-back.
Here's a link to the RC Crazed Slim Fast 4" frame: http://www.rccrazed.com/frames-rc-crazed-rc-crazed-slim-phast-p-610.html
RC_Crazed_Top_Plate_Medium.stl | 769.5KB | |
RC_Crazed_Top_Plate_Short.stl | 529.5KB |