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Sounds like your motor could be connected backwards, causing it to try to spin backwards. The anti-reversal latch will block it, which would build up intense current draw, thus, blowing your fuse.
If it spun correctly out of the gearbox, but incorrectly once assembled, that could be it.
Are you sure your polarity is correct?
OR, it could be a short (as mentioned).
OR your motor height could be too tight. If the motor doesn't immediately spin when you pull the trigger, DON'T hold the trigger down!
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