A possible design flaw has surfaced by DJI Mavic Mini owners experiencing the propellers rubbing against the drone‘s body due to the lightweight and flexible design of the arms. It looks to be a known problem with people already working on fixes for it.
The user had shared that they recently started to notice the front set of propellers tend to hit the drone body, even if new ones were put on. He also stated it was more likely to happen when the drone is in sport mode.
I bought [the] Mavic Mini [to bring] fun to my life but recently found that the Mini’s blade will hit the machine, even if the [propellers are changed], such a problem will reappear to solve the problem [but it didn’t]. [I] want to ask whether there is any Mini owner that has encountered the same problem? I usually am ordinary flight modes, sports file are rarely used.
It looks like the cause of the problem is the flexibility in the arms used due to the weight restrictions DJI was able to keep within. The arms can flex due to the torque of the motors, causing the propellers to get closer to the drone body, and therefore rub against it.
It looks to be a known problem for some as a company has already produced prop mounts that raise the height of the propellers just enough to clear the body fully. There are also designs on Thingeverse that replace the soft foam inserts in the arms with stiff 3D printed plastic. Both of these options will likely set the Mavic Mini over the 250-gram weight limit.
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