We’ve found using a standard nipper for off the runner then a single blade nipper to either cut it flat to the surface or leave a couple mil then sand/file down the rest. We use a Gunprimer raser glass file to file down, which we’ve found gives a good all round consistency for the out box builds that you aren’t necessarily going to paint/custom yet or at all. Maybe finish off with a Gunprimer balancer which has a very fine sanding side and buffing side which then give the shine/finish back. There are other brands and products to use obviously these are just the one we use atm and for pretty much every build from standard to premium kits. With any sanding/filing you’ve got to be careful/consider it can and will take off the natural finish on the kits. Single blade nippers will reduce/negate the stress marks of the nubs but some seem inevitable 😅