mBot Nutholder (soporte tornillos chasis)
thingiverse
If the holes in your mBot chassis have gotten out of hand and the screws are no longer holding the infrared sensor (and auxiliary wheel) or ultrasonic sensor properly, these two pieces can fix the problem. The short "nutholder" is for the infrared sensor. The long one is for the ultrasonic sensor. You'll need M4 nuts (four each time) and two extra screws (in addition to the two you're already using now).
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