Dust under stepper motor

Hey all, a friend and I both have our H2Ds from the second batch and noticed there’s some sort of rubber dust if you will under the stepper motor. It looks like it’s coming from the belt, was wondering if anyone else noticed this? It’s probably a matter of pushing the belt on the pulley a little bit to get away from the edges.

Please note along with the dust there is a strand of filament, ignore that.

Interesting issue. My friend and I are also experiencing the same issue. Definitely interested to see if others share the same issue.