Summary
The original guards for the QAV-R were too narrow for my LS-210 frame and touched the motor. The LS-210 is supposed to be a QAV-210 clone. In any case, I made them fit my frame. I think the original designer said that these would probably break in a crash and be sacrificed. I agree, and will probably swap them for some soft mounts or just print the guards in TPU.
Tag: LS210
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LS210 Motor Guard 3D Print Model