This is a slimmer version of my previous motor-arm protector which can be found here.
I expect it to hold better on crashes but as I was playing around with fillets (my bad) I injured the model causing a bad bringing which I plan to correct at a later time. Nevertheless, this model does not need any additional support or fan cooling at all.
You want it lighter, shorter and stronger? This is the final version of my multipart arm and motor protector and some tips printing it on ninjaflex.
Used PETG with a default extrusion width set to 0.44 and 0.6 for the infills. Everything else remain to auto (0) on slic3r