To protect the little quadcopter motors from those crashes, I've put together a Tough and Simple motor protector for my Argonaut AQ250 using 2204 2300KV motors. This should also fit any standard 2204 design motors. This might not be as tough as a carbon fibre motor protector, but at least it absorbs the initial impact... and then we just print out another one ;-) UPDATES: 19/05/2015 - New "Lightweight" Tough Motor Protector, for those conscious of the extra weight.I printed these with 80% infill, but as it is so small and thin... I doubt it even uses infill.