There is no risk as you have a new one.
I, old styled engineer, would NEVER give such an item to the garbage easily.
It needs to be investigated!
Should be a gear wheel, because you said the motor is working.
The gears are nylon ones and could be replaced,
as these are always standard; I told you!
3-D printing is good,
BUT I don't know if the perfect material is available for printing such a gear wheel,
eg. same characteristics as nylon, the gears are made from.
Screwdriver and courage!
If you are able to print such a replacement gear,
Many would need such one, I suppose!