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M4 nuts and set screws for the gears. I try to avoid M3 bolts unless absolutely necessary, because the nuts spin in the slots unless your tolerances are spot on.

I also recommend a blob of loctite on the motor gear set screw, mine tends to work loose as it gets thrashed around with retractions.

Edit:
Oh and also print at least the motor gear with 100% infill if you can, its under a lot of torque and you need to be able to do the set screw up tight without distorting the gear. The other gears aren't as bad, but I now print all my gears with 100% fill just to be safe, it actually doesn't use much more plastic since the big gears are mostly hollowed out anyway.